According to Gabrielle, a security officer told her that he was looking at her "a** cheeks and it was a problem."
"Don't look at my a** then, there's a thought?" she wrote.
Gabrielle alleged that the head of security and another security officer were just as "rude" and "completely unprofessional about the situation."
"I told them I have bigger thighs and it's just [too] hot for jeans that I can't help they ride up a bit," she explained. "If it doesn't bother me then it shouldn't bother you. They went as far as to threaten to call a police officer. From what I [had] seen today, everyone had short shorties on," she added, noting that it was 100 degrees outside.
"I don't know why I was pinpointed. I'm just disgusted with the behavior of all these people. I was just having a good time trying to look around."
Gabrielle ended the post by encouraging people to share it, admitting: "This whole incident has made me embarrassed."
The teen's message has been shared more than 1000 times, and many commenters noted that they didn't find anything wrong with her outfit.
Gabrielle told the Mirror that she was "just trying to have a good day and walk around the mall."
"When I left the house I felt beautiful and happy about myself, but having grown men attack me about what I'm wearing when I'm just trying to walk around and buy things was just so excessive," she said.
"They didn't have to throw me out. It's a sad day when grown men can't control themselves. I just don't want anyone feeling like I did."
In a statement shared with WKRG-TV, The Shoppes at Bel Air stood by its policy.
"Given the high degree of importance we place on maintaining a family-friendly shopping environment, our policy requires all of our customers to dress in a manner that reflects our code of conduct. Anyone who violates this policy will be asked to change or to leave the premises."
Gabrielle's story has inspired a group of women to organize a "Bel Air Mall "Daisy Duke" SlutWalk" to protest the mall's policy.
As part of the event, women are being asked to show up a the shopping center in their booty shorts and crop tops on Saturday.
"I have personally worn shorts shorter than what she wore and walked past security and police and no one said one word," one of the organizers wrote on Facebook. "It's summertime. In South Alabama. It's hot. WEAR WHAT YOU WANT.
"Don't allow anyone to shame you for what you choose to wear. We're banding together to support our sister in solidarity — women's bodies are not shameful," the person added. "We shouldn't be forced to cover up because men can't control themselves."