Based on my experience attending medieval reenactments and Renaissance faires, I would suggest that if whatever you will be wearing "up top" comes down to mid-thigh or lower, you could probably get away with a jockstrap rather than a dance belt, as your upper garments would prevent any unsightly tell-tale jockstrap lines under your tights from being seen by the audience. If your upper garments are shorter than mid-thigh, stick with a dance belt. You will get used to it, even a thong style, which won't show any lines under your tights, and you will feel more comfortable "in front" for having something between you and your tights. Have fun in your show!