Eleanor was 4lb 11 oz & very skinny.
Teenyfits didn't fit for a good few weeks and then they needed boosting with little lamb bamboo booster.
Tots bots old style nippa nappies would have fitted but I struggled with wraps because Eleanors legs were soooo skinny. If I'd been more confident with wool then is have been fine.
The dolls cloth nappies would have been a perfect fit - but they didn't have any absorbant in them ( because as I pointed out to DH.... Yes Eleanor was the size of a baby annabel doll, but she actually pees! Baby annabel doesn't!!!!!
To use muslins/terries - I think you'd need to cut down the standard size ones because they too were too big for us