iCKERMens Trench Coat Winter Wool Blend Jacket Overcoat Long Top Coat Warm Pea Coat

If my husband normally wears a small should I get him a small in this or does it run small ?

How does this jacket do in cold weather. Such as zero or 10 below. It gets very cold where I live.

Are these made in US sizes?

Could this be unisex?