300 bras??
Yeah, you could halve that, and still have waaay too many, IMO.
Purging is never the way to go.
*However*...
There's definitely nothing wrong with "selective purging." Heck, GG's do it all the time.
Don't like it anymore? Get rid of it.
Don't wear it anymore? Get rid of it.
Doesn't fit anymore? Get rid of it.
Etc., etc.
If it makes sense, donate it to wherever you believe it would best be served. Others could potentially like/wear it.
And if it shouldn't be donated, toss it.
Of course, you could also try to sell it like on eBay or something. Raise a bit of cash, maybe to make room for some new things & so you're not spending "new" money?
I went thru a bit of a selective purging like a month ago or whatever. Just some things that I had purchased like a year ago when I first started getting back into CD'ing. Realized they weren't for me, and not the direction I wanted to go in. So, off they went.
Anyway, keep in mind that there can be a bit of an "obsession" aspect with all this, with some people at some times. Advice for any & all: Try not to get caught up in all of it in an unhealthy way.