Hi, My first post here. I have always really liked jackets but have only in the past few years become more aware of what is around. I bought a Messerschmitt and a 50's Halfbelt from a shop in Germany online about 18 months ago. But of course without trying things on it's always a little hit and miss and I haven't been entirely happy with the fit of the jackets. I feel like the Halfbelt is a little too big for example, marked at a 110-115 chest. It's wearable and usable etc. and is actually a really nice jacket but I am very curious to try other jackets. Since then I became aware of Aero and several times I've been on the verge of purchasing something from them or of theirs from classifieds in here or on eBay or somewhere but have not, partially because there's so many options, but moreso probably because I'm not really sure of sizing. I wrote to Aero a few days ago supplying my measurements and asking for recommendations on sizes but haven't heard back as of yet. So I was wondering if I could get some advice? First up my chest is about 45 1/2" does that mean I should be looking at 46" size jackets? Sorry I am not good with this probably a silly question. If that is the case Aero say you can go down a size on some of their jackets that have a loose fit- so maybe 44" in these would therefore work? I've also been using the measurements on the jackets I have to try and help me gauge what size to purchase, but these measurements don't always correspond to the size of the jacket, ie: a 42 and a 48 of different styles might appear to both be a good fit on paper. Should I go by measurements or size? I understand there will probably be a bit of trial and error, and purchasing possibly sending back for exchange or selling on. I guess ultimately at some point I just have to accept the risk and just buy something!