The suggestions are appreciated. I can get away with some mens' sizes, though with vests, there can be kind of compatibility issues up front if they're cut certain ways. Sometimes I'll just wear like a big dude's shirt and like an army vest. Really loose-fitting can do OK, even if it's probably beyond frumpy.
I'll definitely have to go looking. My wardrobe's really suffered after a few years of trying to get a bit of photoeyness online, anyway, never mind all these really inconvenient other requirements, (when it's hot, anyway.) But, finally, it's starting to look like long skirts that aren't hopelessly translucent are appearing out there. Must trace back to source anyway.
I've been kind of hoping UV-protecting fabric's improved since I last kind of wasted a bunch of money on it. I ordered some of this 'Solumbra' stuff a number of years ago: didn't really live up to expectations, kind of flimsy and plastickey and hot, and didn't really seem that effective or comfortable compared to just layering up a bit.