A tutorial! and if I knew how I'd scan and attach a pattern for 6-12months ish in size, but I don't know how so hopefully you are aware of basic pattern drafting and maybe one day I'll figure out loading a pattern!
To start with I used a T that fits babes well and a dress. I got my top shape from the T (arm holes, neckline) and then the length from the dress and I did a basic dress shape as seen below. (and yes, I did eat a 1/2 a rainbow sprinkle angel food cake while I sewed and it was delicious!) I decided to go with the second (lower) line for the neckline. the bottom half of the front piece you will need to extend a few extra inches so you can have that cute gathered front in the center under the yoke.
Here are the completed pattern pieces. 2 yokes, 1 front piece and one plain back dress piece, and one little rectangle bit for you button loopies.
Now sew biase tape on your back dress arm holes and then attach the shoulder seams.
My material was a bit fray-ish so I decided to do a french style seam. I pinned the wrong sides together and zig-zag stitched.
then turned it right sides together and sewed a line up (like a normal hem just be sure to give yourself a bit of extra rom so you don't see the zig-zag stitch line when you flip)