sand britches

A term for old-fashioned trousers that are worn at seaside resorts favoured by the more mature generation.

"Did you see that Wendy had moved down to Eastbourne to be near her ailing sister?"
"Yes, I heard about that. Mind you, she's not getting any younger herself. What's she going to do with herself when there?"
"There are a number of very nice beaches down there. I'm sure she'll put on her best sand britches and get into a bit of crabbing or something similar."
"Oh that sounds nice. I haven't experienced any crab action for donkey's years. She'll have fun down there."