A white t-shirt is what they call a “must have”, always. I reckon one ought to have at least 3, in one’s wardrobe, at any time, perhaps more during summer. So, if you are missing any, here is a great selection from COS:
You absolutely must look at the details on them, their cut and their fabric. Or not, otherwise you will order them all!!
A white t-shirt will tone down a trousers suit:
a skirt look, a little more casual:
Will make your old jeans very chic:
your chinos cool and more elegant:
and your wide leg trousers even chicer: