I saw a t-shirt similar to this at Anthropologie a while back. I decided to make my own, less expensive version. I used a thrifted white tee and fabric and lace that I had on hand. After laying my fabric out where I wanted it, I used quilt basting spray to hold it in place while I sewed it on. I simply sewed around each piece of fabric, leaving the edges to fray. I also added a little lace trim around the neckline since it was a little low-cut. So simple!! You do want to start with a tee that's not super fitted since it will lose some of it's stretch when you sew your fabric on.