Guardian article on British v American English: "To Brits with knickers in a twist over Americanisms: don't get your panties in a bunch." : r/linguistics
Period-proof pants: Too good to be true? | The Week
phrase requests - Is there a politer way of saying 'don't get you panties in a bunch'? - English Language & Usage Stack Exchange
Innie Belly Button vs. Outie Belly Button: Causes & More
What is the meaning of the phrase 'red shoes, no knickers'? - Quora