don't get your knickers in a twist

The phrase "don't get your knickers in a twist" is a figurative expression that means not to become overly upset, worried, or agitated about something. It is often used to advise someone to remain calm and not let minor or inconsequential matters bother them too much. The term "knickers" refers to a type of undergarment (specifically women's underpants), and "twist" suggests the idea of becoming excessively tangled or emotionally disturbed. Therefore, the phrase encourages people to avoid unnecessary stress or frustration and instead maintain a sense of composure.