I wish I could keep it, but it runs quite small, so my loss is your gain! I was unable to find a listing on lolibrary. The material is a thick jersey cotton. Perfect for wanting to dress down but still be kawaii 

Flat measurements:
bust ~44 cm
shoulder ~35cm
Length ~80 cm (shoulder to hem) 
Sleeve length ~ 62 cm 
Best fits someone whose bust is less than 94 cm and waist is less than 71 cm