Decided to browse ebay UK for the jacket and came up with these:
This one's an Oasis, which is the same brand as the original jacket, but it's a different color. The picture looks black, but the seller says that it's "blue charcoal". Size 10.
This also has similar jackets to Martha and Donna, but it has two different colors for Rose's jacket, a purple and a blue/indigo. Purple in sizes S, M, L, and XL and indigo in sizes S, L, and XL.