Will the color rub off if I wear it over a white T-shirt?

This jacket is washed dark grey denim, and the material is 100% cotton^[1][2][3]. The brand also advises as a care precaution that wearing it with light-colored clothing or bags may cause color transfer due to friction^[4]. If you plan to wear it with a white T-shirt or a light-colored bag, this is something to keep in mind beforehand.

hmmm, as it is a garment with an oversized fit and squared-off shoulders that drapes generously over inner layers, the inside of the sleeves and the body will also be in contact with the inner clothing for longer periods^[5].

Washing is guided in two ways. One is turning the garment inside out and hand washing it alone in cold water, and the other is dry cleaning^[6]. Washing it inside out is a way to reduce friction on the outer surface during washing, and recommending washing it alone is to prevent color released into the water from transferring to other garments. There is also an instruction not to leave it submerged in water for a long time^[7].

Official guidelines for drying or ironing have not been confirmed yet. In general, dark cotton denim is usually dried in the shade away from direct sunlight after pressing out moisture without wringing it out after washing, and high heat from a dryer is typically avoided because it causes shrinkage and deformation. However, it has not been confirmed whether this applies directly to this product, so if you are unsure, it is safer to choose dry cleaning between the two guided methods.