I have a go-to dress that I love for work but can also be dressed up (albeit not terribly excitingly) for other occasions. It fits, flatters and is my safe option. And it's navy blue. As a "cool blue autumn" this is important!
Dry cleaners have ruined it 
. It's currently en route to their "technical department" for a full assessment and report on how it happened. Not much use to me.
I need to find a replacement but can only find it in black here.
I'm tall, 5'10", and need it to come to my knees and be completely plain. Any ideas? Obviously, I intend to get the dry cleaners to replace. The original was about £50 although I'm happy to push for more if it's a reasonable replacement and there's no appropriate, cheaper alternative