From FibreMood:
As a slightly oversized blouse with a collar and collar band, yoke and gathers at the back – Aila is a wonderful addition to your wardrobe. The shaped sleeves make this is a simple project and give the blouse a playful, relaxed fit. Wear Aila with jeans, trousers, or a skirt, either tucked in or comfortably out. Is oversized not really your thing? Just make Aila a size (or two!) smaller. Be sure to check the size chart first to make sure there's enough wiggle room.
Fabric advice
The blouse will drape gracefully over the shoulders and look less voluminous made in fabric with a fluid drape, such as woven viscose (crêpe), Tencel, etc. Does the oversized boyfriend look strike your fancy? If so, choose a somewhat structured fabric to give Aila a little more body. Chambray, poplin, linen, and cotton twill are all great options. Aila looks beautiful in solids but also works just as well in a print, e.g., stripes, polka dots, checks, floral, etc.