Square Neck Long Sleeve Knit Base Shirt Women's Autumn Winter Designer Cut-out Collar Slim Fit Regular Top Inner Wear Core-spun Yarn. This base shirt is woven from high-quality core-spun yarn, which is soft and comfortable, fitting closely without being tight. The unique square neck design subtly showcases the collarbone, adding a touch of sexiness and elegance. The slim fit cut outlines a charming silhouette, allowing you to show off your femininity in the autumn and winter seasons. Suitable for various occasions, it can be easily paired with a coat or worn on its own, making it an ideal choice for your wardrobe.