Dress for Bhutan Trip.Clothing requirements vary greatly depending on the season. Light, loose clothing is appropriate for summer days with evenings requiring a sweater or jacket. From autumn until the end of winter, warm clothes are required. We recommend long underwear under trousers combined with layers clothing, fleece or down-jackets, a hat and gloves. Bring comfortable sports shoes for light touring and hiking boots for treks. Tours and treks at higher elevations require sunscreen, lip balm, and sunglasses.