I am only 5" and weigh only 46 kg, but I wear jumbo size all the time. My Chanel bags are all jumbo size and I wear them cross body with no problem at all.
I only have a M/L. I even thought it was small as it is too tiny to fit all my essentials. After a small wallet, hand phone, small packet of wipes...it cannot fit an Umbrella , sanitizer and my hat! These 3 are my essentials too! I was contemplating a M/L initially and realize its impractical.
The M/L is too expensive too. Now its at least S$2k more than the jumbo in the resale market! I will never buy from boutique to save $, environment and animals. Preloved quality seems better too.