This is for my 8 month old's spider costume I'm making. (stay tuned for pictures coming soon). I bought one of my favorite onesies from Andee Lew, and bought some ruffled lace to match.
I cut my lace at about 17", then situated it how I wanted and pinned.
Just use a simple straight stitch after that and sew along the top of the lace, then you're done!
Your sweet girl can wear this shirt with anything! It would especially look darling with a cardigan over top for winter!
I just had to throw this picture in there too!