Two words: Puffer coats.
Are they women? Have them get ones that are long enough to cover their butts. They will probably want the cute, shorter jackets, that end at the top of their hips, but a strong wind blowing down the street, if they are waiting or standing outside, getting underneath the bottom of the jacket and they will feel COLD.

Get something that covers their butts. Think of a puffer coat as aluminum foil wrapping a baked potato, sealing in the heat.

You want to get a long enough one to work. The really long ones, that go down to their knees are nice if they have to wear dresses to work. But going out shopping & other places, the extra length may be cumbersome, especially while indoors shopping.They will usually have the coat unzipped and the extra length usually bangs into things and knocks things off shelves.
Here is page of puffer coats at Kohls. The light grey coat, fourth row down, in the middle, is what I'm talking about. Or a parka with a hood. No flattened hat hair with a hood.

I actually have the ZeroXposur brand myself. I was leary of not getting a down jacket this time around, but goose down takes way too long to slowly dry after laundering - especially at a coin landromat. I wanted something I could easy wash & dry. The tight weave of the microfiber in the ZeroXposur coats make them very windproof and I think there is a coating to make them water-resistant. Mine is.
http://www.kohls.com/catalog/womens-puffer-quilts-coats-jackets-outerwear-clothing.jsp?CN=Gender:Womens+Silhouette
uffer & Quilts+Product:Coats & Jackets+Category:Outerwear+Department:Clothing&kwid=p3252470660
If they are guys, a good parka is good. Parkas automatically are long enough to cover the butt & have a hood.