In reply to Moorland-wanderer:
I wear a close-fitting 42" Special Six. I bought the hooded belay jacket online in 42". The fit was boxy and loose. I guess it was closer to 46-48" chest. The drawcord at the hem could not be pulled anywhere near close enough for my 34" waist. The hood is not helmet compatible, and the zip broke in two places within the first week. I replaced it with a Decathlon belay jacket, which was 1/3 the price and actually works as a belay jacket should. I've used Buffalo for 15 years, and I really like the S6 and the mitts, but the hooded belay jacket was shit.