From BurdaStyle:
A: Sometimes loose, sometimes tighter (with more puff): With the help of narrow grosgrain ribbons, the sleeves of this blouse can be varied as you wish. The model is closed at the back with a single button. B: This casually elegant top with a bateau neckline is perfectly harmonized to the proportions of petite women. Witty detail: applied grosgrain ribbon tied into bows on the sleeves.