I've really enjoyed reading everyone's responses and I hope y'all have too.
I just totally geeked out and totaled up my purchases by store for both winter (Dec-Feb) and spring (Mar-now) and there are some trends. I still bought a lot via Twice but less thrifting and consignment in spring than in winter, but more eBay and Amazon. For 'regular' stores the counts are about the same with less Nordstrom & Rack than in winter, and more Dress Barn. A few from Loft, ON, JCP, Kohl's, and DSW in both seasons. I could go back and compare to last year's tallies, or at least the ones for summer and fall once I started tracking it, but even I think that might be a bit excessive.