So I'm aware peasants are really meant to be a stopgap solution, not viable endgame units, but in my playthrough I ended up quite fond of a couple of them (One of whom somehow ended up really good at voodoo after I put them through school with a mistaken click). I found them useful as support/medic units and scouts, and I kept a few with scavenged pistols and smgs to be extra guns on base defense which feels very thematic.
I'd like to see more armour options available to them to increase their utility - even if only for RP / headcanon reasons, or wanting to stick to the all female theme. I also found Slave Soldiers very underwhelming, although I expect it was RNG messing with me, my peasants seemed to do great while slaves died horrible screamy explodey deaths. (Or maybe since I disliked them I was unwittingly more careless with them, now I think about it)
There's a tonne of armours that'd feel appropriate - the various ones Slave soldiers can use, but also things like the Maid, Novice, Theban, Gravball, Pirate clothing, Bikini should all come in their sizes. Plus maybe adapted human power armour (the oldschool XCOM sprited stuff), security trooper armour, marsec marine armour? (Some of these also apply to Slave Soldiers, for obvious reasons). I like the idea of a more rag-tag, mixed-troops approach for a band of pirates, at least aesthetically, and it'd be nice to see more options for it. The Loader and Stalker suits are a great start in this direction.