@cyclohexane thanks for asking. You are absolutely good to go with the weight on this fabric.
Calling it "Fall/Winter" was kind of misleading, as it's a fairly lightweight cloth. It just happened to be offered in the Fall. All of these are about the weight of a typical dress shirt.
And you'll LOVE it in person. I bought myself the white one with red roses. Typically these kind of prints are made on a fairly lousy quality base fabric (ahem...cough.. Paul Smith!) but Individualized uses the Albini mill for most of them. The printing is sharp and the shirt itself has a soft hand and a proper drape.
Drop us a line if you need help finding your size, we do that all of the time.
I'll build something out on the website tomorrow or Wednesday... most likely both of the ones with the colored roses. Have to pick a collar... maybe this calls for the Artisan Collar?
Technically, I know my size for the Individualized shirts but my midsection/diet hasn't been cooperating lately and could complicate things if I continue trending in the wrong direction. :)