I work as a change room mom on one of dance recital nights. We have two nights and so far I have gotten lucky enough that DD11's class dances are all on Saturday night and she only has to do production on Sunday. I can honestly say that I never thought to be a helper on the night that my DD performed. That is the night for me to sit back and enjoy her dancing.
Since I get to see the production number on Sat, I help out Sunday with all the costume changes. For our studio, we have three change rooms. One is the quick change - if you only have 1-3 numbers in order to switch costumes - and the change room in the holding area for all the dancers 13 and under, then the teen+ room. The teen+ room, there is 1 mom in there. Those kids have been dancing long enough, they know the drill and they all help each other with zippers, hooks, and snaps. The quick change room is usually ran by 1 or 2 moms and a couple of the girls who have recently graduated. Most of the quick changes are done by girls/boys who have been dancing for years and know the drill. DD had her 1st quick change last year and she said they had her out and into her costume before she could blink.
For those changes that aren't quick, the kids come back up to the holding room. We have an area that is screened off for the changing. Any boys that need to change are sent into the restroom area to get the majority of the costume changed, then we verify that all the accessories are on and on correctly. For the girls, we have a master dance list - contains who is in each number and what their next dance number is, so we know exactly who is going to be coming up and can have the costumes for those girls pull and readly to go. Anybody who has costumes is given the instructions that each costume needs to be on a seperate hanger and that an empty bag for the costumes to be put in after the dance is over. The dance number, teachers name, class day and time need to be listed on the hanger. Each hanger needs to have a bag with accessories attached to the hook. On that bag, we need to know where the bow goes, flower goes, ect. It is a constant flow of kids coming in and out of the change room. As we get the kids dresses, we put the costume we just got off of them into the holding bag. The parents of the newer dancers are also told that your dancer may have more that one pair of tights on at a time. For my DD this year, her dance order is Jazz, Ballet, Tap, then Production. She will have on 3 pairs of tights. Tan, pink, and tan. Once she hits the teen+ room and she is able to quickly get tights on and off, she won't have to layer on, but for the younger kids, it is just easier to pull off a pair of tights and have the other pair already on, then try to get a pair on a sweaty kid.
I can honestly say, that in the 6 years that I have been helping, we have not had any costumes go out on wrong or missing pieces. I don't know if it is because of the preplanning that they do for who's in what dances that we have a really good system and that we have enough moms to help out back stage who have been around long enough that we are whizes at it or if we are just lucky.
I will also say, that hair and make up is simple. Everybody who is in multipule dances knows that they have to wear their hair up in buns, with part on the left. No special hairdo's, unless the girls are old enough to get their own hair up and down outta a bun.