Name: Usakumya Sweets JSK
Brand: Baby, the Stars Shine Bright
Found this for a steal on secondhand sales and it took me forever to find it on Lolibrary because it turns out this was actually some kind of lucky pack set; it came with a long sleeved white cotton blouse, and two pink grosgrain ribbon elastic hair ties. Mine was just the JSK, though. I actually found a second one for sale later on that I got as a gift for one of my best friends who's trying to collect every Usakumya print, so one day I hope to twin with this!
Mine is a size L, as this was from BtssB's days of multiple sizing--it's actually long on me, hitting right at my knees like a lolita dress is supposed to! I love it so much. I also really adore the art style they used for this print, and wish they'd do more pieces that look like this.