I have just discovered this and so wish I had found is sooner! This method combines your foundation chain and your 1st row all at the same time which makes a nice finished edge that is stretchy. I have started to use this for my next dish mat and it's wonderful! Normally I chain for as long as I think I need then start my work only to find that after I stitch into the chain it's no longer as long as when i started as the stitches pull it. Also it's tougher to stitch into the 1st chain. This method is an excelent substute and much easier to stitch. Now I can make a foundation row as long as I need and not have to rip it out because it shrinks!
Right handed instructions
Left handed instruction