First, print out your bodice pieces in the size needed, I went with the standard neckline. Grab your swedish tracing paper, or other paper you can see thru. Joanns also has a grid thin fabric that works well for drafting too. You lay your paper over the front bodice piece and trace the neckline.
Decide how wide you want your collar. I choose 3 inches. It places the collar just a few inches from the sleeve edge. Mark this along the shoulder seam. You have 1/4" seam allowance on this pattern and your collar seam allowance is the same as your pattern. So you do not need to add it in.
Now go to the front of the neckline and mark the same measurement, in my case 3" inches down, make a mark.
I use a drafting ruler to then draw my curved line up to the shoulder line I previously marked. Keep it the same measurement all along the line. Feel free to make the rounded front edge in whatever shape you like: big and round or thin and slightly rounded, up to you. Note you will be cutting 2 pairs ( total of 4 pieces) of mirror image pieces for the front collar pieces.
Follow the same proceedure for the back piece. Be sure you note that you will be cutting the 2 back collar pieces on the fold.
Cut your pieces.
Now that you have your collar you can attach it in a few different methods. I am making another Angie Dress this week using the bias tape method.
If you are lining your bodice, take your collar, lay it on top of the outer bodice fabric, right side up. The peter pan collar ends meet right in the middle. Either mark the neckline center or give it a quick lil iron to help you center the collar points. Lay the lining bodice right side down. Sandwiching the collar between the two. Pin thru all layers. You can also baste the collar then sandwich if it seems to be too many layers. You then sew your seam allowance. turn it right side out and proceed to the bias binding of the sleeves. And the rest of the pattern.
I hope this helps you design the Angie Dress of your dreams! I know I love mine and will be making more garments adding a peter pan collar here 'n there!