lol, thats ok when I use to makea lot of totes I would just make my own patterns for different sizes out of card stock use until they were worn and then draw and cut another! well one day I drew out my pattern, this perticular bag had a six inch gusset, you can only imagine my surprise when I cut the pattern out of some <rather expensive> fabric and started sewing, I then realized that when I drew my "pattern" out, I fogot to add the three inches on both sides and the bottom for the gusset. The bag was suddenly six inches narrower, and three inches shorter than it was suposed to be!
Thank goodness I was working on a diaper bag for myself, it suddenly went from a "fullsize" diaper bag to a mini one bottle a diaper or two and some whipes bag! LOL