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!
I used to do this to my girls' jeans after school let out. Great way to boost the summer wardrobe for next to nothing! Transform an old pair of jeans into adorable summer shorts using bias tape. Instructions on the site.
Make an adorable DIY apron from old t-shirts! Beth Huntington has the best ideas for transforming old shirts and things into new, fashion-forward wearable items. This is great for beginner sewers or experienced ones!