The top hat is for formal occasions.
这种高顶帽只有在正式场合才能戴。


be for..适合    例句：The hat will be good for cold winter days.这顶帽子冬天戴上非常暖和。I'm interested in seeing a pair of shoes to be for my new red dress.我想买一双鞋来配我的红色的新裙子。