This is oiled cotton, but it doesn't feel sticky and can be worn normally. There is a smell characteristic of oiled cotton and slight oil stains. Since there is almost no feeling of wear, I believe this is the intended specification. I also only tried it on after purchasing and have kept it in storage. In my opinion, the size feels like a Medium. Length: 62cm Width: 50cm (The sides are ribbed, so there is some flexibility) Please forgive any slight errors as this is amateur measurement. If you have a preference, I can ship via either Yu-Yu Mercari or Raku-Raku Mercari. #RalphLauren #DownVest #AmericasCasual #RRL #Vest