First, the difference in warmth between the 13 ounce and the 16 ounce won't be that great...the nice thing about wool is that it wicks moisture and breathes to a certain extent. If you're really sweating () August temperatures, a PV kilt would probably be a better choice but I can see wanting the weight of the wool.

Second, it sounds like the fella in Detroit has the same concern as the fella in Chicago: packages sitting unguarded on the front porch. Perfectly reasonable urban paranoia!

Best

AA