I have a Dannimac trench coat which is the lightest coat I have ever held! Mine looks like this style, comes to my mid calf, but is in an oatmeal colour, not purple

https://www.simplybe.co.uk/shop/dann...ur:Lilac,size:

I take it with me when I travel because it rolls up very small, is waterproof, but still looks smart and like a much more expensive coat (I have been asked more than once if it is Burberry)

I bought mine years ago, so not sure if they are still making the type I have, but may be worth looking at that brand?