well sure
Business casual is always a safe bet but for those thinking about other attire remember a few basic rules that I've heard from my own upperclass DS since he's been at the Academy:
1) No one with a body fat index over 15% should ever consider wearing Spandex - this rule applies equally to all regardless of age or gender. In fact I know both DS and several classmates feel this should be the law of the land, even if a Constitutional Amendment is required.
2)Men the ages of their fathers should wear their pants such that they top out on their waist. There is no need ever to have/wear your belt at elbow height - i.e. above your beer gut. If you have a beer gut consider the alternatives which include "at the high end" liposuction and "at the low end" tasteful, somber suspenders.
3) Woman the ages of their mothers, when in public forums/events such at USMMA PW, should NOT wear blouses, etc. that are cut in a manner such that their bras are prominently noticeable. While the occasional exposure of shoulder bra strap is acceptable, an outfit where a "bra cup" is always visible is not. It's embarrassing to them. Further such outfits should not be worn by a P/C's mom without a bra during parents weekend, even if she "can and does pull it off well." It's just has way too many potential outcomes that are problematic.
4) The above said, the upperclassmen all are absolutely fine with sisters and girlfriends of P/C's opting to wear "swim wear" whenever they are on or near campus during the weekend, especially if they have no worries re: the body fat content limits that apply in rule number 1.
Kidding aside - biz casual, age appropriate "conservative" attire and COMFORTABLE shoes are advisable for Friday on campus. Also it can be hot and sticky walking around. USMMA students are always ranked as one of the most conservative student bodies in the nation.....