Try some brooches
Add some brooches, decorative jewelry items designed to be attached to garments, in order to revive your old clothes for a different look. You can buy these unique brooches from your nearest garment or jewelry shops.
Switch out some colorful and well-shaped buttons
Sew buttons to your old clothes to come up with a new unique look. You can sew them on one specific side or simply add them to neck or sleeves area. Buttons are available in various color shapes and designs; you just have to add them.
Sew on fun details on your old clothes
Sew on flowers, cartoons, laces, crocheted inserts, pockets, patches, stencils, embroider fabrics, dangling beads, ruffles or feathers to highlight your old clothes for added detail.
Think of unique design with fabric paint
You can make some designs on your plain old clothes with fabric colors. Sketch a design on your clothe and paint it according to your choice. You can make flowers, cartoons, art designs etc. Additionally, you can adjust the neck of the shirt according to your size.
Re-Size your old clothes
You can re-size your loose old clothes to a more fitting size for a new and comfortable look. Re-sizing old clothes is as effortless as this: turn your loose old clothes inside out; put the sweater on and pin up the excess from either right or left side. now, take it off and sew all along the pinned areas to give it a shape according to your size.
Turn the sleeves into to half sleeves or sleeveless
Cut the sleeves of your old clothes to make it half-sleeves, quarter-sleeves or sleeveless. In addition to that, you can gently cut it down from the center and add some stylish button to give it a cardigan look.