Tykables sells a decent variety, from solid onesies to snap-crotch jeans.
Baby Pants sells some things like plastic pants for under cures clothes but also pajamas, overalls, and nice shortalls.
Lil Kink Boutique has some different onesie prints but also cute dresses that fit well and are actually long enough to cover a diaper. (I don’t particularly like when dresses are very short)
JoeyCuties has very, very cute pajama sets with sometimes adorably retro prints.
Cosy n Dry has onesies with classic, soft baby prints. Their nighties are cute too but too short for my tastes.
Babykins sells cloth diapers and booties.
Etsy has some really great sellers, like ForeverABaby and BigTot, if you search around:
My Binkies and Bows
It seems a lot of the better quality stores like Privatina have closed down in 2020, unfortunately.