You're looking at Mini Boden brand girls dress in size 5-6Y / 116cm.  It is long sleeve and about knee-length.  It is navy blue with polka dots and has an embellished/texture unicorn on the front.  100% cotton.  It has some fading/darkening, wrinkling, and piling from washes and wear.   

Bid with confidence - I'm a 100% seller since 1999 for good reason!  Will ship for free via trackable USPS ground advantage.  Ships from pet and smoke-free home.