I actually just wanted to come up with coordinates for some stuff I'm thinking of selling, and the end effect was rather cute together. I wish the blue outfit was in pink, so it'd look even more big-sister-little-sister-pair, but as it is, the two outfits together kind of remind me of Margaret and Alice.
For the individual outfits:
Headbow, Blouse, Vest, Skirt, Neck Ribbon: Innocent World
Shoes: LK Bennett
Headbow, Cutsew, Skirt, Socks, Shoes: Bodyline
Parasol, Bag: Offbrand