In the book "Trekka", written by a fellow about his adventures when he attempted to sail around the world, he says "the sky had a blue hole in it that was as big as a Dutchman's pants"
We are trying to figure out if he means it was a Big hole? or a Small hole?
In your listing under "Dutchman's Breeches", one of the descriptions refers to a flower that is not round but jagged around the edges. That would explain it nicely if he was talking about the shape, but we have been assuming he was talking about the size of the hole not the shape.