Another suggestion: secondhand clothing stores. I haven't perused the women's section in any, so I can't say for certain they'd work well, but if it's anything like the men's section, I've noted that there's usually a fair amount of "somewhat bigger" and "somewhat smaller" clothing. I'd also guess that even where the women's/junior's clothes fall into the "trendy" category, that they're not the *current* trend, but a smattering of trends from over the past decade. And the prices are usually excellent. (Moreso at Goodwill than at a specialty store like Ooona's, but still.)

The disadvantage, of course, is that if/when you do find something you like, you can't just buy a whole lot of that and call it a day.

(There's a stereotype that clothes from, eg, Goodwill, are shabby-looking. In my experience, while it's certainly possible to *pick* bad-looking secondhand clothes, the same is true of nearly anywhere one shops.)