Size Guide: S=US 4-6, M= US 8-10, L=US 12-14, XL=US 16-18, XXL=US 20-22, 3XL=US 24-26. Please reference the size chart below on "Product description". Ruffle sleeve: The sleeve are elastic, People with thick arms maybe tight, You can consider buying a larger size. Square Neck: The square neckline of this casual t-shirts is open and feminine.More Flattering to match with your necklace. Matches: It's a bit sexy and stylish, Looked flattering and cute with jeans, denim shorts, leggings, jackets, high heels or sneakers & a touch of jewelry. Occasions: Suitable for any occasions like home, work, office, vacation, beach, party, dating, weekend gathering or casual daily wear.