ribbed tube top summer outfit idea trending summer top strapless top warm weather style summer must-have tube top outfit closet essential vacation outfit idea effortless summer look going out top stretchy tube top hot weather outfit summer wardrobe staple neutral summer top minimal style chic summer basics lightweight outfit weekend outfit idea capsule summer wardrobe LTKsummer LTKunder50 LTKstyle easy summer outfit summer trend ribbed knit top summer fashion find LTKFindsUnder50 LTKStyleTip