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their website shows people with cold weather gear

A scarf that's barely covering the bottom of the guy's face? They don't know true winter. (or, like, Muslims)

It's a tiny minority of Muslim women who cover their faces, just for the record. (I assume a head scarf wouldn't interfere.)

I'm curious: can you suggest a source for this statistic?

It's really not a controversial point. I don't know how one would get precise statistics on it, but see e.g. the Wikipedia article: