one in, one out

What started with a lucky Miyake find and deeply discounted Westwood boots is turning into some tentative designer collecting. I have searches set up for some of my favorite designers on Ebay, and so far I've found a Westwood top and Comme de Garcons blazer. I'm adhering to some limitations so I don't go crazy:

• It has to be something I'll actually wear, and in my size - no chasing something the wrong size or potentially unflattering just to see how it's made.
  
• Never full price because... just no. I can't afford such extravagance and besides, finding a bargain makes the pursuit more interesting.
  
• I have limited closet space so for each item I get, one has to go. It doesn't have to be an identical item (get a skirt and, say, a pair of shoes goes) but it's certainly ideal if I'm replacing "ok" with "better" (the CDG long blazer replaces a pinstripe one that never fit properly).
  
• It has to be representative of the designer's work. I refuse to shell out $$ for a t shirt with a logo.
  

So far this strategy is finding me ~3 pieces a year. Which is plenty.