If for some reason I wanted narrow lapels, I'd have probably just purchased a narrow lapelled tweed jacket in the first place. That's usually cheaper and easier and yields better results than buying something else, and having it re-done to suit me. After all, it's not like tweed jackets are all that difficult to find, that one need settle.
2. The inside label says Hartford Clothes for I. Rosen Memphis. Google turned up nothing.
I googled I. Rosen Memphis, and the very first result was a link to a story from 2007, about I. Rosen going out of business after 97 years. http://www.commercialappeal.com/news/2007/nov/20/ending-a-97-year-tradition/
As for Hartford Clothes, the name doesn't ring a bell for me, but obviously they made the jacket in question. for sale by I. Rosen. If you search for something like "hartford clothes" "mens clothing" I suppose you'll come up with at least a few relevant results. What, exactly, do you want to know about them?