Hi Anne. I got the black one in Finds from ASOS last year and wore it all through late Autumn, early Winter and early Spring. It's medium weight poly cotton, lined. Not warm enough for true winter, but I did wear it on some days in deep winter with a long cardigan underneath.
They have other colours. Personally I really like the rust.
They also have something called a "mac". I am not sure what the difference is, but it looks very similar to a trench.
And while I was collecting these finds in ASOS I spotted a rather nice teal trench coat, but that is by another brand, so I am not sure what it is like.
And, pertinent to Angie's suggestion, did you know that Zara is now selling online here? Much better than going to a store.