Fruit of the LoomGirls' Undershirts (Camis & Tanks)

daughter age 10, not ready for bra, want something tight to wear in place of bra/shelf bra ? Would this work?

does anyone have the measurements of these tanks? width seam to seam & length from bottom of armpit to seam. hoping to cut up and create neck buff.

I ordered these and received gloves. Why?

What size is a medium?