Details you might include in a listing:
Fabric: Cotton / cotton blend
Shirt style: Long‑sleeve / full sleeves, button front, casual cut
Inner tee: White, crew neck
Fit: Regular / slim / relaxed (specify)
Sizes: S, M, L, XL, XXL
Color: Navy (outer), White (inner)
Features: layering style, breathable, everyday wear
Care: machine wash, do not bleach, wash with similar colors