I started with this:
It's a man's button down denim shirt. These are staples in my area. I think every man has at least one in their closest. I was thankful to find one in great shape, it looked new! Let's talk about how I picked my shirt. I wanted something cheap, I wasn't sure how it would work out so I didn't want to invest much into it. This shirt ended up costing me around a nickel. I also paid attention to length. I knew by the time I got something long enough there would be some tailoring that would need to be done but that was OK.
I wondered why there isn't always a lot of photos on these kind of tutorials. I quickly realized why, no two can be done the same. What I needed to do for my body may not be what you need to do. I will explain though so you have a starting point or at least some ideas.
I started by cutting the sleeves and collar off. I also very carefully removed the pocket. Then I turned it wrong side out and tried it on. I marked where I needed to cut the shoulder area. When I tried it on the edge of the sleeve started half way down my upper arm. I also needed to take in the sides. I used binder clips to hold the sides where I wanted them. After sewing the sides I tried it on again to see if there were any more areas that needed fixed. The bust was in dire need of some attention. I needed a dart on each side. (I had a feeling this would needed done and is why I took the sleeves and pocket off.) Then I had to put it all back together.
I thought it needed a pop of color so I grabbed a couple of bandannas and went to work. I traced the collar on the bandanna and cut two, be sure to cut it larger for seam allowances. Sewed them together and attached it. I trimmed the pocket in the bandanna fabric and reattached it. I also shorted the sleeves, gathered them up a little bit, I needed bring them in so that they would fit correctly and put a cuff of the bandanna material on it.
Now I have this: