Love the idea of reusing clothing as there are so many in the thrift store that have barely been used.
My only question is why cut it up in strips right away? What if you cut a bunch of 2 1/2" strips and then find a pattern that uses 6" squares and you realize that "that was the perfect print"?
I would deconstruct the clothing and of course depending on how much you have, sort into colors/plaids/creams.
Once you've made a quilt, save your leftovers and store them into marked containers for sizes.
I have a box for each size under 1 1/2" , 1 1/2", 2", 2 1/2", 3", ....up to 6" and over. Anyting bigger than 10" goes into a FQ box labelled by color. Yes I know, can you spell OCD...........
Everyone has their own system, I just never precut fabric for the sake of having scraps.
Have fun
and welcome to the world of never having enough fabric.
Carole