Trim nappies for underneath clothes it's always going to be a trade off between absorbancy and trimness. IB are great although didn't suit my DD (too narrow in the crotch and rise) Bum G are nice and trim but very $$$$ at the moment. Haute traditionals are awesome, great booster system and snaps or velcro options. Swaddlebees AIO are an awesome trim nappy and have a pocket for extra boosters and they have the OSFA pocket as well which is a nice trim nappy with an organic cotton/hemp insert.

Have fun shopping