Not a very warm jacket; it's not insulated. Plenty of room to add layers underneath. Warm when you do so. Blocks wind as well as leather can. It's also not a bad sunshield with minimal layers.
It's definitely a comfortable jacket. I love putting it on. I like the silky lining and the weight of the jacket. When I first put it on, it was incredibly stiff and squeaky-- no bueno. I started wearing it to do anything and everything and now it's just squeaky during movies. Squeaky armpits for life haha. I've only had it for two and a half months. My shoulders really aren't broad enough for this thing, but I think it fits me ok. I ordered the small. The back of the jacket sits right at my tail bone. I'm 5' 7" , my chest size is 36 and I weigh in at 62 kilos (136 lbs) or more. My jacket adds about a kilo to my weight on the bathroom scale.
The jacket is slightly roomy for me. Room for warm layers underneath, I guess. Maybe I'm just thin. I like that it's definitely a darker brown than in the picture. It's kind of shiny at the same time as it is distressed. Probably a protective layer or something. I hope the sheen goes away, honestly.
The cuffs are in good condition, but they seem easily frayed. I've realized the sleeves are a tad longer than I'd like them to be. Even so, when I put my hands in the side entry pockets, it's a slight struggle to free them. Some of the stitching has actually come loose on the left front pocket to make a small hole when that part is stretched. Probably just a defective stitch, because this jacket is otherwise solid.
TL; DR: Not a pilot. Coolest looking jacket I've ever owned. Non-insulated. Nice dark brown. Squeaky. I love the feel. The pockets are functional but feel awkwardly placed. Size small is a little roomy (chest size 36). Maybe should've ordered the extra small.