If you want to make your T-shirt look a little bit more "rock," adding slits is the way. This is reasonably easy to do and if you have an old T-shirt ready to be thrown out, you can practice on this one first. If you have giveaway T-shirts that tend to be too big or have slogans across them, cutting slits is also a way to wearable to wear the shirts and still look fashionable.
Things You'll Need
Place the T-shirt flat over an ironing board. Place the front underneath the board so you can only access the back of the T-shirt.
Working across the width of the back of the T-shirt, pull up a section about 1 inch wide. Pin across the bottom of the fold. Do this three times in a row across the back of the shirt, leaving 1 inch between each fold. Start the folds to 1 inch away from the side seams on either side.
Cut the folds down the middle for the length of the fold.
Unpin the folds and reveal the three slits.
Repeat this procedure across the front of the top of the T-shirt if you also want slits there. Alternatively, while wearing the T-shirt you can cut the slits across the front. For the back you can cut the slits freehand without pinning (see link in Resources).