The Basics Series 3. Long-Sleeve Tee Every polished wardrobe starts with pieces that work hard. A great long-sleeve tee is one of those "wear it on repeat" essentials. Layer it now, wear it on its own later, and you'll reach for it far more than you think. Simple doesn't mean boring. Wearing an XS, runs tts LTKSeasonal LTKOver40 LTKSaleAlert