@Sara Waters - I am reminded of your story of how rebellious you "felt" (ha ha) throwing a wool sweater in the wash after years of being instructed not to. Yipee! Let's go felt some sweaters!
turn a t-shirt into a bag = t-bag
How To Make a bag from old sweater
Glasses Case Tutorial. DIY Tutorial Soft glasses case to be sewed. http://www.free-tutorial.net/2016/12/glasses-case-tutorial.html
Used jean bag
slipper socks from old sweater
Sew a Mini Messenger Bag. Photo Tutorial http://www.free-tutorial.net/2016/12/mini-shoulder-bag-tutorial.html
Re-purposed Sweater Ornaments