anything goes - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Everything is permitted, as in You're wearing sneakers to the office?—Why not? Anything goes these days. This idiom began life as everything goes, which appeared in George Meredith's novel The Egoist (1879). In America anything was the preferred word, which gained further currency with Cole Porter's use of the term as the title of his 1934 song and musical comedy, Anything Goes!