YOU SAID:

my dog fell down the stairs in a bee costume

INTO JAPANESE

私の犬は蜂の衣装を着て階段から落ちました

BACK INTO ENGLISH

My dog fell down the stairs wearing a bee costume

INTO JAPANESE

私の犬は蜂のコスチュームを着て階段から落ちました

BACK INTO ENGLISH

My dog fell down the stairs wearing a bee costume