• Denise Mercedes and Maria Castellanos have been best friends for five years.
  • In 2019, the two friends posed in matching Aerie bikinis to show their Instagram followers what it looks like on different body types.
  • Mercedes is a size 14, and Castellanos wears a size two.
  • Mercedes and Castellanos have also been sharing TikTok videos that show how the same outfit looks on their different body types.
  • Visit Insider’s homepage for more stories.

In 2019, Denise Mercedes and Maria Castellanos posed in the same brown bikini from Aerie to show their Instagram followers that the same swimsuit looks good on their different body types.

Mercedes is a size 14 and says she has an hourglass figure, while Castellanos wears a size two and says she has a more athletic build.

The swimsuit photo Mercedes and Castellanos shared in 2019 inspired their #StyleNotSize series

As part of the series, the two friends share TikTok videos and Instagram photos that show how the same outfit looks on their different body types.

“The whole purpose of the series is to portray two different body types wearing clothes that we both look great in,” Mercedes previously told Insider.

http://instagr.am/p/BzOFMjFBBZK

Mercedes wanted her audience to see that their size shouldn't stop them from wearing a bikini, so she came up with the idea to pose alongside Castellanos in matching swimsuits.

"I wanted to get the same swimsuit as Maria because I wanted to showcase that we are both completely different sizes, yet we are both wearing a bikini and we both look really good," she said. "The audience was so excited and they loved the idea."

When they were first shopping for swimwear, it was actually Castellanos who kept aiming for one-piece bathing suits, while Mercedes was adamant about wanting them to pose in a bikini.

"I didn't feel secure enough to put myself out there," Castellanos told Insider. "I'm the one who has that ideal 'summer body,' but I was still feeling very insecure. Denise was the one who had the confidence and she helped me."

Since the response to their first photo was so positive, Mercedes and Castellanos decided to share another photo in which they posed in matching cheetah-print swimsuits from Amazon.

"People say you should only wear a bikini if you have a bikini body, but we're trying to say there is no bikini body," Mercedes said. "The bikini body is whatever body you have."

http://instagr.am/p/B1ZEQcCADFx

Castellanos said Mercedes is the one who gave her the confidence to share a bikini photo on Instagram

"She was like, 'Listen, you really don't have to look a certain way to rock this swimsuit,'" Castellanos said. "She inspired me to wear it, and once we took the pictures, I felt so confident standing right next to her and she felt the same way."

"There are skinny girls who have that self-conscious feeling like, 'I don't want to wear that' or 'I can't wear that,'" she added. "It's not one type of girl feeling down, it's all of us. If we can help people feel good about themselves, that's what we are here for."

#stylenotsize one piece swimsuit

Foto: Both admitted that they are always rooting for each other during their photo shoots. Source: Courtesy of Denise Mercedes

Mercedes told Insider that two guys once called out hurtful words while Castellanos was taking photos of her in a bikini, but she didn't let that stop her from posing in swimsuits.

"I can walk around in a bikini and not feel like I'm being looked at anymore," Mercedes said. "When I do publish photos wearing a bikini, I'm hoping people will say, 'Wow, she looks really good in a bikini and if she can wear a bikini, then so can I.'"

Mercedes and Castellanos modeled 3 more matching swimsuits in a TikTok video

"Every time we do one of these, we are in party mode and we just feel so good," Castellanos told Insider of their series on TikTok.

"We are always complimenting one another, and we are here to be supportive," Mercedes added.

@denisemmercedes

##stylenotsize@mariacastellanos_ri

lWhats wrong with being confident - angelmamii7

When it comes to finding swimsuits they both like, Castellanos and Mercedes usually turn to Aerie, ASOS, American Eagle, Nordstrom, Boohoo, and Amazon, as they all carry size-inclusive collections.

"We also make sure the bottoms are adjustable so that we can adjust them if they don't fit properly," Castellanos said. "We always try to stick to more conservative pieces, too."

Mercedes and Castellanos know that wearing a bikini on its own can be daunting at times, so they also like to showcase cute cover-ups.

"Wearing just a bikini can be a little uncomfortable," Mercedes said. "Sometimes wearing a cute cover-up while also showcasing a swimsuit makes it a lot cuter and more comfortable. You want to feel comfortable in a swimsuit, especially when you are out in public."

#stylenotsize white bikini

Foto: Mercedes and Castellanos are planning on sharing more swimsuit pictures very soon. Source: Courtesy of Denise Mercedes

In continuing to share these bikini pictures, Mercedes and Castellanos hope to inspire people and give them the confidence they need to do the same.

"Just how Denise gave me the confidence to do something like this, I want to be able to pass that on to somebody else," Castellanos said.