I bought the J100-FO. It is huge and I mean HUGE! I normally wear an XL in most ACR jackets but I looked at the measurements and "Wide" fit description so I bought an M. It is still very big with plenty of room for a fleecy or insulated jacket underneath. I could have gone to a small. It is very light and thin and I suspect it could be easily damaged by a sharp object. I have the FO insulated trench coat (I can't remember the model id;) and my dog jumped up on me and scarred the side of the coat with his claws. However, he didn't tear it and it doesn't leak but it is clearly damaged.
On-the-whole, I like the jacket. It is very cool-looking; if you like the loose wrinkly look! 🙂 Just size down and keep your dogs nails trimmed . . . or teach him not to jump!