one-size-fits-all

[wuhn-sahyz-fits-awl]
adjective
  1. (of clothing) designed to fit people of a wide range of sizes.
  2. Informal. acceptable or used for a wide variety of purposes or circumstances; appealing or suitable to a variety of tastes.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for one size fits all

one-size-fits-all

adjective
  1. relating to policies or approaches that are standard and not tailored to individual needs
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012