I've been looking for a staple grey coat for bloody weeks now and can't find one that I would genuinely fall in love with. Sigh. I'm still on the hunt but for those who are on the hunt for one too I've put together a little affordable guide for grey coats off SheIn. They have some lovely pieces there and unlike sites like Aliexpress, the pieces from SheIn tend to be higher quality and have much more accurate sizing charts.
The selection of coats on their website is pretty impressive - plus you can usually see photos of people who already bought the items in a gallery below which is always reassuring when ordering online!