Soleil Soleil, Sundown Set. The Sundown overswim set is our new summer uniform. Featuring an oversized button up shirt with matching elastic waist shorts, crafted from lightweight cotton. Wear as a set, or each piece separately with your existing warm-weather staples for maximum versatility. Shirt features low neckline with 2 shell button closure. Elastic waist shorts with pockets, Fit is oversized—model is wearing size S, 100% BCI certified cotton