This blouse from St-Martins is absolutely stunning. I have always liked this label. I discovered them in the 90s and I think they had a shop in Carnaby Street, but I could be mis-remembering. I do know that a boutique in Crouch End (where I lived at the time) stocked some of their range. 

I love the detail on St-Martins clothes and this blouse has not only an unusual painters palette print but covered buttons and long cuffs. Super flattering with a little elasticated piece in the back for comfort.