No ... Being topless (or nude) is liked by many but if the venue calls for being topped, bathing-suited, having gymnastic or aerobic tops and bottoms or other applicable attire ... that's fine, too ... The attire (or lack of it) just depends on several factors: the preference of the females (which is probably the most important consideration); the type of audience (if any); the location and local ordinances (we don't need the damn local constables or police interfering with all their crap); any connected causes or programs with the event (charitable fund-raising, etc.); type of environment (private indoor setting or secluded outdoor area ?) and so on.Planning for a successful outcome is foremost.
Topless is the best as long as its is real and competitive match.