I haven’t bought yarn for a bright stripe sweater because 1) I’m still worried about making something that would be too itchy to wear and 2) I discovered almost a sweater’s worth of neutral beige yarn in the stash. It’s 100% wool and also neutral, which is why it never got made into a sweater, but maybe it could make a nice vest?
I like this basket weave one a lot but I’d need to get another lightweight yarn to carry with the yarn I have to get gauge, which defeats the purpose of using up yarn without buying anything. ¯\_(ツ)_/¯
This one would work without buying anything but I’m not sure about the style–it’s not cabled, not one texture, not a full sweater, not a traditional vest shape. I think it would be fun to knit, though. 