Coat for an older gentleman

[MellowMarshmallow]

Where do I start? What are good makes. I am clueless. Totally clueless.

Needs to be warm, waterproof, smart and available as an XXL.

Even just ideas of where to look / brand names to look out for would be a big help.

Thanks.

Amongst my FIL's age group who are all fishermen and ranged between late 60's to early 80's Lands End are quite popular