I did the sock thing years ago – black Gold Toe brand. I hate fabric softener (and I hate the residual smell in the washer from when my husband uses it on his clothes). I have one credit card and one debit card.
My bedding, aside from a pillow, consists of three items: a fitted bottom sheet, a top sheet, and a comforter (in a duvet cover, which could count as a 4th item, except the two behave as one). My bed has a footboard, and I tuck the top sheet and comforter into the footboard, so they don’t move around. It makes making the bed in the morning extremely quick and easy.
I don’t fold my underwear, which is all the same brand and size, I stack them unfolded, and just take the one off the top every day.
I have a lot of good quality clothes-hooks in my closet. The clothes I wear most of the time are on those hooks rather than hangers (except for non-knit shirts). I hang one or two trousers there, from one of the belt loops so they don’t get out of shape. I don’t wear dressy clothes hardly ever.
I don’t iron. I bought several seersucker shirts because not only do I not have to iron them, they shouldn’t be ironed. In the climate where I live, they are warm enough to wear most of the year.
I don’t think of these as simplifying, but rather labor-saving, because I am devoutly lazy. At least about some things.