The tuxedo (smoking) or dinner suit (as it is widely known in Greece and in many German-speaking and non-European countries), is also called tuxedo (in the USA) or dinner jacket (in the United Kingdom and in its countries). Commonwealth) is a semi-formal black suit of two or three pieces, single-breasted or crossed, which is usually worn according to the dress code of western societies for formal evening occasions, ie after 6 p.m. e.g. at a New Year's Eve party or dinner. It is distinguished mainly by the silk lapel of the jacket, and by the outer seams of the trousers which are decorated with a silk stripe called tress as opposed to the tailcoat trousers which is adorned with a double tress.