For winter I've got some Endura thing that has no doubt been discontinued. Tight, unpadded, nice warm roubaix type fabric. They work well (and were one of the few options that could accommodate a significantly larger arse than I currently have, without an excess 6" of leg length), but the ankle zips are contraindicated for MT91 boots.
I've also got some Tracksters, which are looser and lighter, but I mostly use those on the upwrongs (often in combination with the afore-mentioned boots[1]). I'm not sure how recumbent-friendly the waistband is, but the stirrups should keep the legs in the right place.
Altura Winter Cruisers deserve mention as a warmer alternative to Tracksters which definitely don't have a recumbent-friendly waistband.
[1] I've got SPDs on the upwrongs and ATACs/Looks on the the recumbents, because reasons. Which means that the choice of bike dictates footwear and therefore (when the boots are involved) legwear.