Last year, Rag & Bone dropped an entire line of “sweatpants jeans,” which are exactly what they sound like. A pair of pants that feels like and is constructed like sweatpants, but look like jeans.

Pull-on pants — from satiny Reformation ones to Brooke Callahan’s side-tie pairs — have had something of a moment over the past year or so, but in my family, they’ve been the preferred style for much ...