Because its not warm enough to be comfortable outside below 45 or so, isn't a water resistant layer, and the same jacket that is not warm enough waiting on skyhop in MSP is also too hot to comfortably walk in T4 at JFK where it's 78.

I could get behind a change to "if you need a coat, here are the allowed choices if in uniform"

But the Hey, it's between arbitrary dates. Please wear a wool coat in PHX or SAT when it's still 90 out, that's the illogical stuff I could do without.

We kind of address it with the Latin America, Caribbean and Africa plus select tropical destinations carveout we have already.