Many thanks to all the members who have responded.
It will definitely be something mid-weight this time.
I love the look of FQHH, when it has worn in some, and I also love the heritage aspect of it.
I looked at some of the samples I have and Seal Jerky horse is another possibility.
I think I have narrowed it down to
Brown Veg tanned goat
Seal jerky A2 Horse (suggested by Plumbline)
Midweight Steer
Good choices. As others have posted, many period jackets used lighter leather than FQHH. Jerky Horse has many of the qualities that a jacket from the time would have had.