My group does a lot of different makes for charity. We were to do this project for one of the members. Her work place needed something for the guys to do.
It is also to help them with everyday skills.
They include buttons, zips, pockets, key ring clips, counting with a tape measure, press studs, learning how to thread a shoe lace and then tying it. I added a plastic clip buckle for a belt and a cord from a hat that can be shortened by squeezing the clip. There is also plumbing bits that screw together for fine motor skills. As well as the textures of the cloth, metal & ribbons strips.