Please help with formula for bag with gussets
I'm sure I saw a chart or formula on the web and equally sure I bookmarket it - but now it's gone!!
I want to make a quilted bag with gussets. I know how high and wide I'd like the bag and I know what size I want the gussets to be. What I can't figure out is what size fabric to start out with.
There must be some sort of chart or formula to figure this out. Can someone please pass it on to me?
Thanks!!