What to wear?
Bring leotards in different colours if possible, shorts/croptops too. Any lyrical dress or skirt you might have, big shirts are good too for a more contemporary look.
If your dancer does ballet ( and I hope you they lol!) bring pointe shoes if appropriate, tutus- show tutus can be good, practise and romantic tutus too. You can bring tights if you want a very classical look, but bare legs show musculature better, my lighting is designed to show muscles and shapes.
You can also bring other more unusual items, jackets, boots, tap shoes, jeans.
For guys- leggings, cycle shorts, short shorts, vests, big shirts, jeans can look good too.