I got this shirt like a couple of months ago, but never got around to wearing it. I liked the shirt a lot, but I never wear crop tops. I decided to add a dainty little peplum (sort of see through) to it. I wanted the see through effect for summer.
1. I cut out the peplum part as shown below. 37" is how much you'll want it gathered, 13" is how long you want it to be.
2. Next, I just sewed it to the shirt (right sides of the fabrics together), with a zig zag stitch for stretch.
TA DA! Literally, that was it. I didn't hem it since the fabric doesn't ravel.