I’ve spent nearly all my life in warm climates - Florida, Okinawa, Atlanta. It’s only in recent years that I’ve had to do any kind of seasonal “change-out” in my wardrobe, because we’re spending more time in different climates - Toronto, Chicago, NYC, Florida, checking in with older family members.
Most of my wardrobe is season-less and wearable year-round in Atlanta. I have a small very-hot-weather capsule of linen, swim, summer bags and sandals, and another small capsule of cashmere sweaters, thermals, winter scarves, etc.
My coat and jacket collection is another thing entirely. It’s my Achilles heel.
I store our off-season clothing, occasion wear and the BF’s infrequently-needed business wardrobe in the spare bedroom closet. We have one plastic bin apiece for anything that doesn’t require hanging. It’s how I (kind of) rein myself in.
I do my big switchovers around Spring and Fall Equinox, when I know I’m probably not going to have to dig a cashmere sweater back out of the closet, or find a linen dress to wear.
On cross-quarter days and the Solstices, I do mini-edits of my closet and the off-season closet, mull and cull, and check what I have against ideas I want to try, and shopping lists I’ve made . This is pretty fast, not more than a couple of hours. It’s an enjoyable way to think through the colors and outfits I’d like to wear for the next mini-season.