Definition of "ONS"

The government’s statistics agency said suits […] were not bought often enough to make it into the basket of 733 representative goods and services selected to measure the UK’s cost of living. They have been replaced in the ONS basket with a “formal jacket or blazer”.

2022 April 18, Rupert Neate, “The end of the suit: has Covid finished off the menswear staple?”, in The Guardian‎