I order practice clothes....tights, leos, and warmup stuff from discountdance.com or dancewearsolutions.com. Both are good but discountdance has cheaper shipping.
DD has done competition team for the last 4 years. They had tryouts on Friday for this year and she can't wait until tomorrow to find out what team she made. Her teacher either orders their shoes or sends them with a specific style number to a local store. She provides tights and accessories along with their costumes.
Competition team is alot of fun but the older they get the more spendy it becomes. I tell dh to ignore anything in the checkbook written to the dance company!