Everyone needs a good set of basic tees and vests in their wardrobe. I find a Stripy Breton, Grey Marl Tee, White Tee, White Vest and Long Sleeve Black Tee are timeless classics that always come in handy for everyday wear. My go to places for good quality basics are J-Crew, Whistles, Madewell (not so easy to get over here sadly), Boden and Hush.