We're going to show you a little method that we think is the best called the "Pinch and Pin"
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Step 1: Measuring the Shirt
Take your baggy shirt, turn it inside out and put it on.
Step 2: Pinch and Pin
Make sure you have a friend help you with this step. Get our a bunch of pins and then pinch the excess fabric and pin it so it fits how you want it to.
Be sure to pin all the way to the bottom of the shirt and don't forget under the arms. Repeat on the other side.
Step 3: Sewing the Shirt
Once you've got your shirt pinned, you're going to start sewing a seam starting above the armpit all the way down the side.
Step 4: Cutting the Excess Fabric
After you're done sewing both sides, try on the shirt to make sure that it's the right fit. If you're happy, you can cut off all the excess fabric and you've got yourself a shirt that fits!
Step 5: For Serious Shirt-makers
If you're serious about make a shirt from scratch, we recommend purchasing "Shirtmaking" by David Page Coffin.