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Fabric comparison
A muslin cotton onesie and a muslin cotton romper come from the same bolt of fabric, the difference is only in the cut. Both are woven loose and open so air moves through, and both get softer with every wash. Which one to reach for usually comes down to the weather and how much coverage you want that day.
By Vanessa & Bob, Epic in Bali · Updated 25 July 2026
| muslin-cotton-onesie | muslin-cotton-romper | |
|---|---|---|
| Fibre and cut | Both start as the same double-layer muslin cotton we use for every Epic piece, pre-washed so it arrives soft, with flat seams that don't dig in. The onesie is a bodysuit that snaps at the crotch and stops at the diaper area, no legs attached. | Same fabric, same pre-wash, same flat seams. The romper is cut as one piece that carries on down the legs, either shorts length or full length, so there's no separate bottoms to match up. |
| Breathability | The open weave lets air through no matter what, and with the legs bare there's simply less fabric touching the skin. | Just as breathable fabric-wise, but it covers more of the body, so more skin sits under cloth than with the onesie. |
| Weight and feel | Light by nature of being less garment, easy to move in, easy to change quickly. | Still light thanks to the muslin, but a touch more fabric overall since it covers the legs too. |
| Hot-weather performance | Bare legs plus an open weave make this the cooler option on the hottest days. | Handles heat well too, the weave still does its job, it just has more coverage than the onesie so it runs a little warmer in comparison. |
| Softness and everyday wear | Same muslin, so it softens the same way wash after wash and creases the same way too, that's just how the weave behaves. | Identical softening and creasing pattern to the onesie, since it's the same fabric cut into a different shape. |
| Best for | Hot days, quick diaper changes, layering under a romper or overalls, or as a first piece for a newborn. | One complete outfit with no pairing needed, cooler days when a bit more leg coverage helps, or whenever you want to get dressed in a single step. |
Choose muslin-cotton-onesie if you want the simplest, coolest option for hot days or a base layer you can put other things over.
Choose muslin-cotton-romper if you want a single piece that covers your baby from top to bottom without adding anything else.