I think the idea of the wonder hanger and only 5 of each is such a fab idea. I've been thinking about what I've got and there's quite a few categories where I have more than 5 (if short sleeved blouses and long sleeved ones are the same category then I have 10 - albeit 3 of which I don't wear as I bought them a year and half ago before I went on the pill and therefore up a cup size!)
Thinking about things this way is really helping to think about what I can pare down and although, for instance, I'm not going to get rid of 1 of my day dresses to bring it down to 5 I doubt I will replace the next one to wear out.
It has made me realise I need to get down my 'summer' box from the loft and sort through it now, with a calm, wintery head! I find if I try and purge things in summer I get caught up in the whole romantic idea of summer being a big long holiday when actually I'm in the office just as much!!