No brand label, I believe it’s a SHEIN top. . Top is a sz medium but due to smocking can also be worn by a large. Pit to pit 15”with stretch to 21” Length 17.5” Womens Long Sleeve Blouse Top summer casual blouses; lightweight and breathable fabric, comfortable to wear; Suitable for summer, spring and fall.Occasion: Suitable for Work, Office, Outting, Dating, Shopping and Daily Wear. Material:Woven Fabric Dark Green / Boho / Floral / Top / Square Neck / Frill / Long Sleeve / Shirred / Bishop Sleeve / Regular / Slim Fit / Non-Stretch / Woven Fabric / 95% Polyester / 5% Elastane / Machine wash Model is Wearing:S B16