3D and personal objects such as Football T-Shirts, hats, books, medals etc. need to framed so that they are strong and secure inside the frame, but the framing should also be able to be reversed. A good framer should never fix anything permanently inside a frame!
To get a soft item, such as a football shirt to retain a good shape, acid free mount board is cut into a shirt template shape which is then placed in the inside of the shirt and the shirt placed nicely around it.
The shirt sleeves are then sewn into the desired position. The piece of board with the shirt around it is then stitched to the backing mount board and framed as normal with a good-sized spacer or box mount.