There will be some quips and jibes taken at you for this but continue to take it with the same sense of humor you already have. That's just the way it is here. I'm starting to get used to it myself.
Marfans...again, another point of understanding. Yes, 38 mm should suit you best. When I was diagnosed with a heart condition, it was suggested that I seemed to have many traits associated with Marfans, despite being short, and to have my general practitioner look into it. I was very young at the time without many resources or good insurance so I never did. My current doctor has never mentioned it. Looking at my daughter's build, I sometimes wonder. I'll be more proactive in her case. I was extremely thin and getting things to fit me was always a chore. Alas, middle age has cured that problem!