But first! Some annotations:
I cut off the shirt's collar and covered it with bodice fabric (folded as it was, so two layers of shirt-fabric - I have no picture though).
Do check / alter the shirt's seams before sewing bodice!! My Dad's shirt's shoulder seams were quite on top of the natural shoulder, and after re-sewing the pieces they were, like, short above the top front edge of my corset! Back then, shoulder seams had to be on the back. Sadly the fabric was already cut and there was nothing left over, so...
I stitched another, fake shoulder seam on the back, ending up with two seams looking surprisingly decorative as underlining the requested broad shoulder area. Lucky turn!
Make sure to have a smooth hem line. It may look awry when layed flat on the ground. But there are many curves and bulges on a human body (created by natural shape, corset, skirts etc.) that won't accept a geometrical hem line. For that, pin it on yourself / a good dressform (I don't have one).
You could use the shirt's cuffs and cover them, like the collar. I didn't, I just made a regular hem at the end of the sleeves.
Yeah, there we go. Note that both, shirt and bodice fabric, were sewn together, using the shirt as lining. When everything is ready, you might want to have some (more) darts or other alterations. Do whatever you want until the bodice fits you!
|See the seams? The upper one is just for decoration.|
|inside. not pretty. I don't care :D|