How far north of the equator do you have to go before you actually need clothing to keep warm?

Question

I'm thinking in Europe/Eurasia

Answer 1

You can do it right on the equator if you go high enough up certain mountains.

Answer 2

Well, in addition to latitude, altitude of the place and distance from large water bodies, vegetation or lack of it etc. play important parts. Even 17 degrees north (from the equator) is good enough to make you feel cold in winter.

Answer 3

That depends on what time of year it is and what direction your headed.