I started my hand in t-shirt cutting a few months ago when I wanted to match my son's Plex Halloween costume. I just the weaving technique on the back, cut out the neckline, and tied colored ribbon to scrunch up the sleeves. This turned out pretty good for my first time and this is how it turned out.
I later did more t-shirt cutting for myself, a friend, and her daughter using the same technique when we went to a Yo Gabba Gabba concert. I didn't have enough time to experiment with different styles so I just did the same weaving technique. I ended up weaving the back of my t-shirt three times since it was too loose. Here's how our t-shirts turned out.