シック (shikku)

今夜こんやどこか行いくの？シックに決きめてるじゃない。

Going somewhere tonight? Look at you - all dressed up like that.

シックで上品な制服と歴史ある静かな雰囲気が特徴の女子高なのだという。

It's said to be a girls' high school characterised by its quiet and traditional feel and a chic, high-class uniform.

まだホームシックなの？

Are you still homesick?