If your child in the song Gaston and is a wolf(Chase Loftin, Aubrey Landers, JJ Strittmatter, Anthony Smith, & Brooklyn Boyd):
Their base layer that they need to wear to the high school is a pair solid gray of jogger style pants.  The shirt type doesn't matter because we will get that from the costume shop. 
They may also want a pair of athletic shorts for back stage, color & type doesn't matter because they won't be seen.  I may have told them differently this weekend but I just realized this will be best. 

For anyone else, if I haven't gotten with you about your base later yet, I will shortly. Thank you all so much!