Eyekepper Little Girls' Mermaid Costume Halloween Costume Mermaid Dress The size 110cm don't mean the dress's length,it meas it suit for kids who height is 100-110cm. Size 100cm :Suit for height 90-100cm,3 Years /Size 110cm :Suit for height 100-110cm,4 Years Size 120cm :Suit for height 110-120cm,5 Years/Size 130cm:Suit for height 120-130cm,6 Years Size 140cm :Suit for height 130-140cm,7 Years/Size 150cm:Suit for height 140-150cm,8 Years Suit for Halloween, birthday parties, or even a fun filled night .