However, Duggan — who was writing from the South Shore Swimwear's official Instagram account — didn't agree with the cover model selection.
"Come on now! You could not find anyone better for this cover? Not everyone should be in a swimsuit [vomit emoji]," she wrote.
And it didn't stop there.
When faced with criticism over the comment, which many described as "fat shaming," Duggan lashed out at other users. One response to the claim said that it wasn't fat shaming because Schumer "fat shames herself in her comedy routine."
There were a couple users who agreed with Duggan (to which the account replied "thank you!!"), but for the most part, the consensus was with InStyle's decision and the right for women of any size to wear a swimsuit.
Duggan defended the comments in a statement made to the Huffington Post, where she called upon the First Amendment's right to free speech.
Amy Schumer through her career
Amy Schumer through her career
SANTA MONICA, CA - JANUARY 17: Actress-writer Amy Schumer accepts Critics' Choice MVP Award onstage during the 21st Annual Critics' Choice Awards at Barker Hangar on January 17, 2016 in Santa Monica, California. (Photo by Kevin Winter/Getty Images)
BEVERLY HILLS, CA - JANUARY 10: In this handout photo provided by NBCUniversal, Presenters Amy Schumer and Jennifer Lawrence speak onstage during the 73rd Annual Golden Globe Awards at The Beverly Hilton Hotel on January 10, 2016 in Beverly Hills, California. (Photo by Paul Drinkwater/NBCUniversal via Getty Images)
BEVERLY HILLS, CA - JANUARY 10: Amy Schumer arrives at the 73rd Annual Golden Globe Awards at The Beverly Hilton Hotel on January 10, 2016 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
WATCH WHAT HAPPENS LIVE -- Pictured: Amy Schumer -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
Comedian Amy Schumer performs at Glamour's presentation of 'These Girls' at Joe's Pub on May 20, 2013 in New York City. (Photo by Astrid Stawiarz/Getty Images for Glamour)
Comedian Amy Schumer performs on stage at 'Comedy Central's Stars Under the Stars' at Central Park SummerStage on June 26, 2013 in New York City. (Photo by Neilson Barnard/Getty Images for Comedy Central)
Comedian Amy Schumer attends the 'Anchorman 2: The Legend Continues' premiere, sponsored by Buffalo David Bitton, on December 15, 2013 in New York City. (Photo by Cindy Ord/Getty Images for Buffalo David Bitton)
Comedian Amy Schumer attends the 'Girls' season three premiere at Jazz at Lincoln Center on January 6, 2014 in New York City. (Photo by Andrew H. Walker/Getty Images)
Honoree Amy Schumer accepts the Breakthrough Award for Comedy onstage at the Variety Breakthrough of the Year Awards during the 2014 International CES at The Las Vegas Hotel & Casino on January 9, 2014 in Las Vegas, Nevada. (Photo by Jeff Bottari/Getty Images for Variety)
Comedian Amy Schumer speaks onstage at NRDC's 'Night Of Comedy' benefiting the Natural Resources Defense Council at 583 Park Ave on November 5, 2014 in New York City. (Photo by Bryan Bedder/Getty Images for NRDC)
Actress/comedian Amy Schumer poses for a photo at the book signing for her book 'Not That Kind of Girl: A Young Woman Tells You What She's 'Learned' at Barnes & Noble Union Square on September 30, 2014 in New York City. (Photo by J. Countess/Getty Images)
Amy Schumer attends the Glamour 2014 Women Of The Year Awards at Carnegie Hall on November 10, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Glamour)
Comedian Amy Schumer attends GQ and LeBron James Celebrate All-Star Style on February 14, 2015 in New York City. (Photo by Jamie McCarthy/Getty Images for GQ)
Comedian Amy Schumer arrives for the GQ Men of the Year Party, at Chateau Marmont in West Hollywood, California, on December 4, 2014. (Photo by Robyn Beck/AFP/Getty Images)
Amy Schumer attends Comedy Central Night Of Too Many Starts at Beacon Theatre on February 28, 2015 in New York City. (Photo by Stephen Lovekin/Getty Images for Comedy Central)
Amy Schumer performs onstage at Comedy Central Night Of Too Many Stars at Beacon Theatre on February 28, 2015 in New York City. (Photo by Mike Coppola/Getty Images for Comedy Central)
Actress Amy Schumer (L) and producer Kim Caramele arrive at the screening of 'Trainwreck' during the 2015 SXSW Music, Film + Interactive Festival at the Paramount on March 15, 2015 in Austin, Texas. (Photo by Michael Buckner/Getty Images)
Host Amy Schumer attends The 2015 MTV Movie Awards at Nokia Theatre L.A. Live on April 12, 2015 in Los Angeles, California. (Photo by Rich Polk/Getty Images for MTV)
Amy Schumer poses for a photo in the press room during the 2015 MTV Movie Awards on April 12, 2015 in Los Angeles, California. (Photo by Frederic J. Brown/AFP/Getty Images)
Actress Amy Schumer speaks at Tribeca Talks: After the Movie: Inside Amy Schumer during the 2015 Tribeca Film Festival at Spring Studio on April 19, 2015 in New York City. (Photo by Robin Marchant/Getty Images for the 2015 Tribeca Film Festival)
Honoree and Comedian Amy Schumer pretends to trip and fall on the floor in front of honorees Kim Kardashian (2nd-L) and Kanye West (L) as they attend the Time 100 Gala celebrating the Time 100 issue of the Most Influential People at The World at Jazz at Lincoln Center on April 21, 2015 in New York.(Photo by Timothy A. Clary/AFP/Getty Images)
Comedian Amy Schumer speaks onstage at Universal Pictures Invites You to an Exclusive Product Presentation Highlighting its Summer of 2015 and Beyondat The Colosseum at Caesars Palace during CinemaCon, the official convention of the National Association of Theatre Owners, on April 23, 2015 in Las Vegas, Nevada. (Photo by Michael Buckner/Getty Images for CinemaCon)
Actress Amy Schumer accepts the 'CinemaCon Breakthrough Performer of the Year Award' onstage at The CinemaCon Big Screen Achievement Awards Brought to you by The Coca-Cola Company at The Colosseum at Caesars Palace during CinemaCon, the official convention of the National Association of Theatre Owners, on April 23, 2015 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for CinemaCon)
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"I appreciate the free press. It's called Freedom of Speech," she said. "I can have my opinion and you can have yours. I'm tired of the media and publications trying to push the FAT agenda. It's not healthy and it's not pretty. What is wrong with featuring healthy and fit cover models?"
Later, Duggan claimed the author of the Huffington Post article, Jamie Feldman "lied" and misrepresented her comments in another Instagram caption.
"I NEVER CALLED AMY SCHUMER A PIG and I NEVER CALLED HER FAT. I simply commented 'You could not find anyone better for this cover?'," she wrote.
Many of the commenters called out Duggan for her statements, reaffirming a woman's right to wear whatever she wants.
"Anyone who wants to wear a swimsuit should feel able to and it's no one else's business," said one user.
"Not very smart to comment something like that," wrote another. "There are so many great people in the world. All those great people don't all look the same, we are all different in our own ways. We own our bodies and if you don't like that well we will see how that works out for you."
Have the honor and privilege to be part of my beautiful bestie @stephmatson #bridetribe
Love this girl so much
Neon in Costa Rica, on my app.
Always laughing with this beauty ❤️❤️ #vacation #throwback to last night ☠️
Tree branch view...
Laughing in bathrooms with friends
Just another day at the office 🦀💦👙 @swimsuitsforall #summerofyou #swimsuitsforallsummer17
Happy 2017 from us 💚
where i belong💙
Loving you so far 2017. ✌🏻
Stripe vibes 💋
Gone to the beach ... 🐚☀️🌈
Soakin In the sun...#heaven #mexico
Mele Kalikimaka and happy holidays everyone! Sorry been away from social media over the holidays while spending quality time home with the ohana! I'm back now! Sending so much aloha and sunshine from #hawaii 🌊💋🌞
Enjoying my last few days of 2016 in Paradise. Yes yes I know, I'm back in Hawaii & I should just move here already. 📸 by the bday girl @allymaki
Needed a vacay so badly
je t'aime mon'amie
First day of vacay and this is how I feel! 🙌🏼 #happyholidays🎄
On a island wit a pretty lil hitta on her bday 🌊 @nickiminaj 🎂😁
Lord, I thank you for another year of life. #TurksAndCaicos Birthday vibes. Thanks for the 💟u guys. Right back atcha😛
HH brought me back a Lips💋Bikini. 💋💋💋💋💋💋💋💋 Yes my hair is different in this shot. And Yes I'm 53. And yes I fucking own it. 😜
👋🏼👋🏼 Hello world I'm on a secluded island and my phone just broke!!! what a perfect way to celebrate thanksgiving ☺️ don't call or text me.. just be with the people you're with! (Unless ur my dad, then call Jack for emergencies lol) Happy turkey day!!!🦃 Spread lots of love to everyone you see today.
New vlog from my week in LA LA Land is up! Link in bio 🙌
it's too cold in NYC, I want to be back here 🌺 @brooklynhawaii @jasminemullins_mua
Almost 30 and thirsty @hotelwailea
Don't be afraid to start over. It's a chance to rebuild your life & live the way YOU want. 📸by @therichardmarx #cabo 🇲🇽#50birthday #celebration 🙌🏼
Caught this today spear fishing!!! 🐟🐠the only reason I don't feel terrible is because I'm eating it for lunch 🌮🌮
Caboooo it's lit😉😈🙆🏻
This is living
Having a terrible time
Just us girls ... having fun ☀️💦💕 #foreveronvacation #Dubai #alebyalessandraswim
#samesamenotdifferent made it to the Caribbean. Get your tee now!
13 going on 30 .... @jennalynnrenee @alyssafgreene @e2homesltd @slbenedon @karibeeander 📷 by @tommycole
Flashback - harbour island -thank goodness it's Friday. @superelixir ! Run into @nordstrom to get some @ellemacphersonbody lingerie.
Not tossed by the waves or drawn by the breeze. Master Dogen. #free
Two of my three in one photo 💙💦☁️ miss u Musette hummingbird nightengale viola violet moonbeam
Shanina sells seashells 🐚🐚 by the seashore 🌊🔆 Bikini @shemademe
Thankful for the fans who came to my concerts in Honolulu last week💖💖 Getting some extra island time at @grandwailea before going back to work!