What kind and size of shirts? How many do you want to show?
Displaying them for what purpose?
Not understanding what you are doing. Why and how are you "displaying" shirts?
like for a crafts show?
A bit uncertain on how you want to display shirts, here is Pinterest with some ideas, maybe you can find something that will serve your purpose:
We put a special tshirt on display in a dollar tree frame. For regular shirts, we made a quilt out of grandpa's shirts for some grand sons to have on their bed like a throw pillow to have him with them always. Hope these ideas help, LIsa.