Be certain about how heavy you want the jacket to be. Some of the premium brands like Aero make great stuff but I don;t liek wearing such heavyweight leather, I feel like I'm in a straightjacket... Remember a big coat like this might weigh 8 pounds - fine if you like that kind of thing.
And the rest, I asked aero about a jacket similar style to a barbour international and going through the footage of leather for my size (47 inch chest 6 ft tall) with Will ,he reaconed on about 14 pounds .....scared me off totally. 10 pounds I could live with but 14 was just too much.
I went throught the footage again and with the 4 oz leather I still came to a figure of around 12 pounds but once you start throwing the crap you carry round with you in the pockets the weight would be too much.. the thing would have been left in the wardrobe and never get worn.
I am going my own one now and it is going to be in 1.1- 1.2mm cowhide so should come in around 7 pounds which should be spot on for colder weather but would work uf a sweat in the summer.