recycle your jeans to make a fast skirt! I bet you could do a Velcro trim or fun buttons around the top of the fabric and on a pair of jean shorts and have an interchangeable skirt with several bottom options kind of like the skirts for purses.
10 Pretty Maxi Skirts to Sew: DIY Maxi Skirt Tutorials
Sew top of jeans onto skirt material. I used an old pair of jeans & an old skirt. Its so much easier with an old skirt just make sure you get the hemline correct before you sew it together. (BW) perfect for those too short girls skirts too!
crochet detail on t-shirt restyle - great way to make a shirt just a little bit smaller around the waist, or where you need it. (I've pinned something like this already, but here she uses a crochet hook and has lots of close-up pics.