Flat nappies with eenee pouch pants worked really well on my skinny lad. Bambino Mio covers were OK but not always perfect. Fitted were hit and miss most of the time.
Flats were great even with stuffables as he got older - but he was too skinny for them when he was younger.
My tall and skinny-ish DS goes well in cuddlebots pockets (but I replace their microfibre trifolds with my homemade hemp trifolds for less bulk). He's also done really well in Bonnibuns (rapid dry is my favourite style, but I do have the workhorse style ones as they were 50% off a while ago).
Bookmarks