we dont wear jacket if if would be hot, to keep ourself warm we wear jacket in cold season not in hot season. So cold will be correct answer and not HOT

'jacket' is an article of clothing we wear when it is cold. Similar to a coat. Rainy, cold, and snowy all describe cold weather conditions. 'hot' is the opposite. So, 'hot'.

I am never hot in Scotland... so I have to wear a warm jacket all of the time!

In Norway, I always bring a warm jacket and shorts no matter the weather. I swear it can rain, snow, be sunny and hail the same afternoon because of our mountainous terrain.

Oh, I wore warm jacket in winter at cold weather. Now I have to wear it in hot weather