I was really thrilled to be given a series of measurement charts by one of my clients MJ at https://mjsslipcoversgta.ca/ who does slipcovers professionally across Canada. She developed these charts over the years and uses them to give to clients who want to have mail order slipcovers done. She designed them to be really easy to follow. I have several of these for all different styles of furniture but I will release one at a time.
This one is for a the typical Lawson style sofa, with the rounded arm fronts. You can use this for an armchair as well.
The red lines indicate where to take the measurements.
These charts are so great, I expect them to be super popular.