Here are 12 shirts for adults and teens featuring some of my (and people I know's) favourite musicals. You get Hamilton, Rent, West Side Story, Grease, Les Miserables, Oklahoma, Hairspray, Wicked, and The Sound of Music, all shirt-ified for your theatre-sims. Base texture is a blend of Fanseelamb's and my own.
You can find a crappy swatch of all the shirts right along here.
Download here! Meshes by Amaryll and Trapping included.