From Longman Dictionary of Contemporary Englishbe the height of fashion/stupidity/luxury etcbe the height of fashion/stupidity/luxury etcVERYto be extremely fashionable, stupid etc Flared trousers were considered to be the height of fashion in those days. → height
Examples from the Corpus
be the height of fashion/stupidity/luxury etc• All these artists were the height of fashion in the middle years of the 19C.• The stunning luminous display and thickly padded, genuine leather wristband are the height of fashion in any setting. 