Just received my COS order! A short review of each piece, w/ sizing details:
-Geometric Panel Sweatshirt: Took a Small as a slim 48, and it fits slim but not tight (except maybe a bit in the forearms), lengths are good. Really nice colors and the fabric is lighter weight but warm. Cool Star Trek vibes
-Cotton Flannel Shirt: Took a 38, and it runs very slim but TTS, similar to a Schneider IV in a regular cut. Fabric is really nice, very surprised it's not wool. Collar is nice and stiff, placket doesn't twist or anything. Length is perfect to wear untucked.
-2 U neck tees: Got both in Small, and they fit slim TTS. The white fits me especially well, the grey is slightly tight/short (I think they're from different seasons). Fabric on both is very soft.
-Elasticated Waist Trousers: Took a 48, I am a true 31-32 waist at around the hips. Really nice feeling/slightly sheeny cotton fabric, with the elastic waist almost unnoticeable. Fit is good in the waist, but a bit loose in the thigh and in the calf, but with a sudden taper of around 6.75" at the hem.
Only thing I won't be keeping is the trousers, since I'm looking for more of a slim/skinny fit, but anyone looking for more of a slim/office appropriate pair should check them out. PM me if you wanna buy them from me before I post in B&S, I'm just asking exactly what I paid incl. shipping (~$125). Hope this helps someone!