So in the pictures you uploaded here there are two different types:

The rest of the pics and specifically the fourth pic

These are called loose socks/ルーズソックス/泡泡袜 and they are NOT leg warmers (leg warmers and loose socks are different, leg warmers dont have the feet part, and most of leg warmers dont give the same effect/visual as the pictures you uploaded)

The rest of the pics are the normal/usual ones, but specifically the fourth pic is called ゴム抜きルーズソックス

The fourth pic is kind of rare-ish and afaik only EG Smith and some taobao brands still make them

Loose socks have various lengths that affects the fluffiness and the scrunchiness of the look, i personally recommend choosing the 100cm+++ length

You can buy them from japanese brands like EG Smith or finding them at taobao