Things You'll Need
Crew neck sweatshirt
Crew neck sweatshirts are cheap, easy to find and comfortable. What they aren't is fashionable. However, with a few well-placed snips and the addition of a tank top underneath, you can be rocking the 1980s "Flashdance" style with those who spend far too much on designer retro sweatshirts.
Cut the bottom band off of the sweatshirt. You want it to roll up a bit. This will happen naturally after washing, or you can force the issue by stretching it out a bit. For a shorter sweatshirt, cut off more than the bottom band, but you'll probably want to use the measuring tape to ensure an even cut.
Measure 2 inches from top of the shoulder seam and make a mark.
Cut diagonally down from shoulder mark to the armpit of the sleeve on each side of the sleeve.
Measure three inches down from the neck of the sweatshirt. Make marks every 3 to 4 inches, then cut, trying to hit those marks and mirroring the shape of the neck.
Wash the sweatshirt to allow fabric to stretch and relax.
Patches, paint and other flourishes can help customizate to your new sweatshirt.