Style Arc's Stacie jacket is good.
As far as weight, 9-12 oz, Sanforized with no lycra or stretch is what I would look for. 9 oz is a good light weight, and you want to keep it lighter for the summer, and up to 12 depending on how much structure feel you want. No stretch because it's a jean jacket and Sanforized keeps it from shrinking.
Now me? I'd use selvedge edge denim 12 or 13.5 oz, unSanforized. Because I am a snob, lol.