Follow these tips to make your knitwear last longer than just a season...
1) Don't squash your sweaters into a drawer or hang them up on a hanger - fold them neatly in a drawer.
2) Follow the wash care instructions on the inside label correctly. Some knitwear will require hand-washing instead of a machine cycle.
3) Never ring sweaters dry or hang up on a hanger while wet - this will stretch the knit and ruin the shape of your sweater. So if you need to machine wash: select a delicate cycle with low spin; if you are hand-washing, gently squeeze out excess water by hand and press dry with a towel. Following washing, leave to dry as flat as possible.
4) You can remove rough patches of 'bobbles' (little balls of wool on the surface of knitwear, caused by friction from general wear) from your older sweaters by using a "bobble-off" shaver (Game, Clicks and Verimark stores usually stock them). This will re-new the surface of your knitwear considerably.
5) After winter; the best way to store your knits is in a vacuum-sealed bag, which saves loads of space in your cupboard, and also keeps out the moths.