The first thing I'm going to do is admit I did not read this entire thread, so perhaps someone already said this.
That said, there really is NO reason to go out and spend boatloads of cash on "Camino gear."
Wear what you have in your closet.
Don't wear cotton in the cooler months b/c it will not dry.
Don't take jeans b/c they certainly will not dry.
But otherwise, there is NO reason for special underwear, bras, or outerwear.
If you have regular yoga pants or leggings that are comfie, wear them.
If you have shorts that are comfie, or a walking skirt, wear them.
If you have any polyester shirts that are comfie, wear them.
I WOULD buy good socks, though in summer, I often hit up the China shops on the Camino for cotton socks.
Otherwise, I buy merino wool socks and they do cost a bit.
Also, if you live in the USA in a fairly sized city, go to Goodwill and check out their ACTIVE WEAR section, both male and female.
I just found TWO icebreakers shirts there last week - both Merino Wool and like new.
One was a $200 shirt for $18 and one was a $150 shirt for $10.
For my warm layer, I ALWAYS buy a men's merino wool pullover sweater in a super large size, then I take it home and put it in a hot washing machine and dryer and felt it down to my size. Watch it closely. And even if you can only find one that FITS you, it will be your warmest, most lightweight item.