Is this parka warm enough for winter?

It is a shell-style parka with a hood, so it works best layered over a sweater or fleece. There is no stated insulation fill, so it suits mild to cold dry days rather than deep-freeze wear.

Does the missing zip pull affect use?

The zip still works, but part of the pull is gone, so it can be harder to grip, especially with gloves. A replacement pull or a small cord loop is an easy fix.

What are the measurements?

About 26 inches armpit to armpit, 18 inches armpit to cuff, and 33 inches collar to hem. That puts it in a roomy medium fit that leaves space for layers.

Yes, it has a hidden hood that stows into the collar. That keeps the neckline neat when you don't need it.

How does it compare with a technical rain parka?

It is a casual Nautica parka, not a technical shell. It lacks stated waterproofing and taped seams, so a dedicated rain jacket will handle heavy weather better.