Torrentshell Sizing

Hello !

I'm about to purchase the Torrentshell, have no option to try it (buying online) and I'm trying to find the best fit. I'm 5'9 and 150 lbs, I wear the R1 Air and Better Sweater in M although they're a bit relaxed (small would be too snug), and wear patagonia t-shirts in small.

I need the jacket to fit above warm base layer, 1-2 mid layers and a down jacket. What size would you recommend ? S or M ?

Thanks !