Switzerland!

Not necessarily. There are several companies in Switzerland that do large sizes- one catalogue is called Ulla Popken- they do warm winter trousers, tops, anoraks, etc- but much cheaper on their UK site.

I live not far from French border and buy everything at Decathlon in France.

As a not very out doorsy person, I'm not really au fait with dressing that way. PLUS as I'm a big-bird, I'll really need to take stuff with me, because it can be hard to get in my size.

Will I need things like a down jacket and salopettes?

I live in the Neuchâtel region, not far from Bern and Lausanne.

Just warm things, layers are best. And of course a warm pair of boots and gloves.

Wow, that was fast. Where? By pm if you prefer. If in my neck of the woods, we could meet up for a cuppa soon.

And in a French, German, Italian or Romanche speaking area?