Does anyone have recommendations on stores to purchase spandex outfits. Such as catsuits, leotards and bodysuits?

Dancewear shops are usually the best bet for Spandex. Here in Yorkshire, we have World of Dance based in Leeds, they have a shop in the Central Arcade and also do on-line. Most cities will have a similar shop run by a retired professional dancer, it's a way to go on earning once someone's active career is over.

I've personally used Dance Direct and Planet Dance a lot, both when I used to dance in my "normal" life, and in some of the scenes I've produced.

Something to bear in mind is that dancers are typically small, so depending on who it's for and their body structure, you might find that even the largest size available runs on the small.

I've got loads of spandex outfits almost exclusively form Katz Dancewear. I love their stuff. I'm a UK size 20 but can squeeze into their largest size (size 6) long leg catsuits. The short legged ones/anything that is just leggings can be a little tight xxx