The phrase "simple tee" refers to a basic or plain t-shirt that is uncomplicated and does not have any elaborate designs or detailing on it. Full definition
It's light and fun to wear with simple tees and tanks, and with print - mixing floral tops (sim). (notdeadyetstyle.com)
It's also super easy to create different looks by pairing it with a blouse like mine to dress it up or simple tee for a more casual look. (doreensstylediary.com)
Simple tees in the neutral shades and a hat would go perfectly with such cropped jeans. (outfittrends.com)