Tie-front. Double collar. 100% cotton. The simple Bettina summer blouse by Oska is one of the highlights of the season. Slit on both sides up to the sleeves, the back of the Bettina tapers off to sections that decoratively pull round and tie at the front. The Oska Bettina is an effortless tie-front style shirt in crisp cotton. A perfect summer blouse from Oska. Double-collar and mid-length split sleeves. 100% cotton.