Is this parka waterproof?

Nothing in the listing claims waterproofing. A polyester blend sheds light rain better than cotton, but treat it as water-resistant at best and not as a shell for heavy weather.

What size does it fit?

It is listed as fitting a medium. Because it is a 1990s cut, expect a roomier, boxier fit than a modern medium, and ask for chest and length measurements if fit matters.

Is it warm enough for winter?

There is no stated insulation or fill. A polyester blend parka works as a wind-blocking outer layer, but you will likely need a sweater or fleece underneath in real cold.

What condition is it in?

It is described as very good condition for a used garment. Expect minor signs of wear consistent with age, and check the listing for any noted flaws.

Can I machine wash it?

A polyester blend generally tolerates a cool, gentle machine wash. Wash it alone or with similar colors, and skip the dryer to avoid shrinking or setting creases.

Why buy an unbranded parka over a new one?

You get a 1990s silhouette and a plain black shell that new budget parkas rarely copy. You give up a brand warranty, a stated waterproof rating and a known size chart.