Ack! Don't buy more. Instead, get in the habit of getting the clean clothes put away or you will just end up with laundry all over your house - and isn't that what your nice dressers and closets are for? When we went down to 2 main baskets (one for DH and I, the other for the kids in the bathroom) magically, the clean clothes got put away because we had no place to put the dirty ones. I have a spare to collect overflow like sheets, blankets, and extra towels but really, less is better because it forces you to complete the job.
If you dread putting the laundry away because your closets and dressers are too full, be relentless with keeping only the clothes you all wear, love and look good in. Out of season clothes should be stored somewhere else, and that which you don't actually wear because it doesn't look right on you, is worn out, etc. should be trashed or donate. Check out flylady.net if you need help with tackling laundry. A load a day, washed and PUT AWAY, really works!