There are some print placement differences.

The Birthday dress is the same style as the Moonbow dress so stick to your regular a sizing if you have that one. Similar sizing to the Simpson and Red dresses. 

This gorgeous Blue and White checked print dress features a shirred front, a matching fabric belt and sleeves that truly work both on and off the shoulder.
The border of the skirt of the dress and the sleeves has a black jewel like print.

SIZING (all measurements are taken with dress lying flat from front side.  Double for circumference of outfit).
The top is ruched with elastic and has a lot of stretch. 

BUST Small 37cm, Medium 39cm, Large 40cm , XL 44cm , XXL 47cm

WAIST Small 31cm, Medium 33cm, Large 38.5cm, XL 39cm, XXL 41cm

HIP Small 58cm, Medium 63cm, Large 65.5cm, XL 67cm, XXL 69cm

LENGTH  Small 112cm, Medium 113cm, Large 114cm, XL 115cm, XXL 115.5cm

FABRIC 100% polyester.