I spotted the floral pinafore dress on eBay, and from the back of the plaid pinafore (which I also found on eBay), I have a feeling that it is sort of worn back-to-front. A high-waisted skirt with braces has the same kind of effect. They both have quite a cutesy feel and I love those prints.
1,3,4 - eBay
2 - Copenhagen Street Style