For those that haven't made theirs yet and don't really know how to go about doing it, I'm going to let you know how she made hers.
First off for measurements. Measure from the side of one of your breast to the side of the other one. That'll be how wide the top part of the heart will be. The point will be in the very middle of your bust, Make the humps of the heart as if it was going to cover you like a bra. And from the middle of your bust to your belly button is the length of the heart top peice.
The apron is in 3 different peices, The heart, band, and bottom peice. She tried to do it all one peice but the heart didn't fit right on the rest of it. It's also made with two layers and then turned inside out. The lace was sewn onto the back after it was turned the right way.
The stripes are made from a 7/8" ribbed non satin ribbon that you can find in all the colors at joannes and probably other fabric stores. The ribbon is placed 1 1/2 inches apart from each other. And is attached using Steam A Seam. Make sure you melt the ends of the ribbons using a lighter before attaching them, so they don't fray.
I hope this helps some of you. And I hope I didn't make it too confusing. I was going to use a different method but I think I'm switching to hers for the simplicity. :) If you have anymore questions just let me know and I can ask her more questions.
Can't wait to see you all at Katsu! ^^
Tiff has already made her apron and it came out great! Here's a picture of the top of it: