A few of the comments I recieved:
"You look fantastic!"
"You look kinda like Tegan and Sara- it suits you." (No pun intended.)
"[That suit is] sexy." To which I mumbled an incredibly awkward thanks.
I did get a few funny looks, but no one said or did anything that was outright negative. Some of the more "plastic-y" girls (please excuse the Mean Girls reference) from my soccer team threw some quizzical glances my way, but those were people I can without any hesitance say I don't give a damn about. Besides, after graduation, I don't have to talk to any of them ever again if I choose not to.
A few days later we were signing one another's yearbooks, and a few more comments popped up. Someone wrote, "You rocked that suit!" and "I was amazed at how well you looked the other night." So while I still felt periodically awkward throughout the entire night of prom, I think it was good to challenge myself. (I even did a bit of dancing, which is something I generally refuse to partake in.)