We're coming up on sweater weather, y'all.
You should wash cotton, silk, and cashmere after two to three wears, since these pieces are more delicate. Wool and durable man-made blends, such as acrylic and polyester, can withstand five wears. Whatever the fiber, follow the care instructions on the label. –Real Simple
Dry cleaning is nearly essential for wool or wool blends. Cotton can be dry cleaned, but it isn’t as necessary as with wool. Machine washing wool will damage the fabric and probably ruin your sweater. You can hand wash or machine wash most cotton or cotton blend sweaters. –Real Men, Real Style
Gently squeeze water out of the sweater and then lay it flat on a towel. Roll it up like a sleeping bag to really suck up the excess water. Dry it by laying it flat on a clean towel or a drying rack. – Madewell
The unavoidable truth is all sweaters will pill just by wearing or cleaning them. You can remove pills easily by holding the sweater flat with one hand and slicing off pills one at a time with a simple razor, like a Bic. –Madewell
Step 1: Fold your sweater in half. Step 2: Place the hanger hook in the armpit, and fold the waist and sleeves over the hanger. Step 3: Ta da! A stretch-free hang (and some serious sweater origami). – Huffington Post
Wet the sweater down and put it in the dryer on very high heat until it’s bone dry. You can customize the shrink with how wet the sweater is: Completely soaking it will lead to more shrinking, while misting it till it’s just damp will shrink it less. –Madewell
Quite often, the cuffs of sweaters will get stretched while the rest of the sweater looks just fine. To tighten the cuffs, dip just the stretched area in hot water and blot slightly. Place the wet cuffs on a white towel and dry them with a hair dryer set on hot air. This will slightly felt the fibers and tighten the cuffs. – About.com
If you have a serious infestation, you need to call in the professionals. Sweater moths can cause thousands of dollars' worth of damage to clothing, carpets and curtains. Otherwise, here are some sensible steps to discourage the little blighters from taking up residence in your home. → Search and Destroy: How To Get Rid of Sweater Moths