The word 'accoutrements', is a rather old-fashioned one. According to a dictionary it means 'a soldier's equipment, excluding clothes and weapons' --i.e. things like helmet, armour, spurs.
Nowadays some writers, especially in fashion magazines, use it as a rather fancy word to mean 'outfit, accessories etc'.
e.g. The King dressed for battle in new and shining accoutrements.
Dressed as he was! C.P
clothe or equip, typically in something noticeable or impressive.
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So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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