How to Make a Baby Romper from a T Shirt

Co-authored by Shaelynn Haning

Last Updated: June 3, 2024

If you're tired of the ho-hum pastels and puppies for your baby's clothes, you can easily make your own rockin' duds for your little stud from vintage tees or band shirts. Here are instructions on how to make a romper (also known as a onesie.)

Steps

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(aka a "onesie").
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. Fold both the t-shirt and the romper in half and lay the romper on top of the shirt, lining them up at the fold. Trace.See how the crotch on the romper puffs up because it's in a shorts shape? Ignore that. You'll have to fudge a bit for the bottom part. Use the image as a guide.You should narrow the sleeves (or take them off altogether, up to you). So basically you're cutting a chunk out of the armpit and then letting it widen for the legs.

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]] Sew on the armpit line only . Don't close the leg area.
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. Go ahead and cut your bottom line too, just make sure you leave enough to hem or you'll get an underwear shape.
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onto the other side. Don't let your cat help, he doesn't have thumbs.
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.
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. If you use snaps, reinforce your fabric with something that doesn't stretch so they hold up better. Make sure your closures are so that the flaps point toward each other when you go to close it. So both sides should be facing up when laid flat.
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. Otherwise, you'll want to hem. Cut that little diagonal slit between the crotch flap and the rest of the leg so your corners don't bunch.
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.
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Is it possible to make a romper without having to sew anything?

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Use fabric glue. I got a large bottle from Walmart for $20 and I use it for everything.

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Tips

Using a youth t-shirt will minimize bulk in the shoulder area. If you want to use a larger shirt, you will need to make the neck smaller. A seam in the back will do this for you.

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If you don't use sleeves, you can hem the armholes for a more finished look.

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For a larger shirt, it's better to avoid using sleeves unless you're willing to do a major overhaul.

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