I love sewing projects when they take under one hour because otherwise they usually don't get finished. The piles of projects I have sitting around because they took longer than an hour is enormous. I also love to make patterns from my favorite pieces of clothing. I picked up this shirt in a clothing swap (free!) a few weeks back. I needed a Christmas present for my sister and realized she would love this shirt as much as I do.
If you think you will use this pattern over and over use muslin to make pattern pieces that you can re-use. For this example I skipped making the pattern and pulled out the fabric I wanted to make the shirt from. Use a similar fabric as the original you are copying. This blouse was stretchy and so I'm using a stretchy spandex. When I use stretchy fabric I usually sew on my serger. It was on the fritz so I used my good ole Phaff using a zig-zag stitch for all the seams.
There are 4 pieces to this shirt. Three in the front and one in the back.
Starting on the front top section fold over the shirt so you just see piece 1.
Cut the piece out 1/2" larger than the original. This shirt was tight in the arms so I extended the length of the armpit to the shoulder.
Flip piece 1 over and cut a copy. This is piece 2.