If you are involved in a dance team or re-enactment troop (any age, any country), you get used to walking around in strange costume - so much so over festival season, that it can feel very weird wearing jeans and a Tshirt. If you're booked to perform during the day, then costume is de rigeur and it's usually too much of a faff to change in and out of it (unless you're the one in the full suit of armour with pot helmet and crest) just to go for a sing.

Of course, you have to ask yourself, how do you KNOW it's pirate dress? These days, from what I see on the news, pirates wear Armani.

LTS