You're looking at the n°267 tina in Raven, designed by extreme cashmere.

This small, short-sleeved t-shirt is crafted from a luxurious cotton-cashmere blend, combining 70% cotton for crisp structure and breathability with 30% regular cashmere for added softness. The Tina features a square fit that offers a relaxed silhouette, making it less fitted than the America style. Perfectly designed for XS to S body types, it’s a versatile addition to your wardrobe.