You may also want to check out Headwind Mfg. for more cape skin ideas.
+1 for Headwind Mfg. I had ordered a custom Aviatrix with capeskin for my wife. Even with the tartan wool liner, it feels lighter than her denim jacket.
However, if you want a jacket for warmer days, you probably don't want a jacket with wool knits, as they trap the heat in.