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Step 1
Determine the best place for the pocket. It can be near the inside of the waistband or inside one of the legs.
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Step 2
Cut some material into a square or rectangle. Make it small enough to fit inside the pants but large enough to actually hold items.
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Step 3
Turn the pants inside out so you can see exactly what and where you are sewing.
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Step 4
Lay the cut pocket material on the pants. Line it up exactly in the place where you want the pocket.
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Step 5
Pin the hidden pocket material to the pants on 3 sides. Make sure you leave the opening of the hidden pocket at the top so your items do not fall out while wearing the pants.
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Step 6
Sew the 3 pinned sides of the hidden pocket to the pants. This can be done using a sewing machine or by hand stitching it. Feel free to double-stitch the hidden pocket for extra security. Use a thread that is the same color as the pants to help hide the fact that a pocket is stitched on the inside. Remove the pins when you're finished sewing the pocket in its place.
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Step 7
Flip the pants right side out. Place some loose change in the new hidden pocket to check for holes.
