How often do you purge?

One of my aunts once told me that every time she buys something new, she gets rid of something old. I think that she was specifically talking about her wardrobe at the time; get rid of a pair of shoes when you buy a new pair; new pants, old pants, and so on. This seemed genius to me.

Of course I have quite a book collection, and it isn't entirely for me, so that isn't something I purge from very often. My clothes are definitely possessions I go through regularly to get rid of what I don't wear anymore, doesn't fit right, or isn't looking as good as it once did. Since I've been buying all of my clothes at thrift stores, it seems apropos to just thrift them back. "From whence they came..."

Moving is the best time to purge of course. Spring cleaning, or something similar, will also do quite well. I myself have begun purging mid-November because I watched Hoarders for the first time, and it made me anxious.

Final note: If someone could please give me an appropriate range of "number of pairs of shoes allowed one individual female person", that would be very helpful to me (I tend to return to my feral child roots when I'm unsure about something). It may be helpful to know that I am a professional person. I try really hard to live simply, but I just bought another pair of (used) Dansko clogs, and now I'm up to three pairs, and I'm feeling like that may be too many, but I don't know which ones to get rid of.

Mantra #1: Donate what you don't use!

Mantra #2: When in need, always ask for help!