fashion and Mens Evening Wear does change although at a far slower rate than women's evening wear. One thing does remain perfectly clear regardless is that if your tuxedo or any other formal attire has been sitting in your closet for over 5 years or so, it would be a good idea to get rid of it. Believe it or not, that that classic tuxedo that you use for your mens evening wear has more than likely become staid. As in, obsolete if you want to look like you really care about your appearance and how well dressed you can be.
Many men don't realize it or simply ignore the fact that mens evening wear evolved every single season just like womens clothing except that it evolves in baby steps. It's like a slow metamorphosis that by the end of it's five years or so, it just doesn't even look like the same style. That is because mens evening wear designers are always tweaking the look and style of the tuxedo whether the lapel narrows or widens, the cut and fit of the jacket loosens or becomes more tailored to the torso. Even the length of the tuxedo jacket will actually rise or lower in length like women's skirts. So when all is said and done, your trusty evening wear just doesn't look as good anymore because it has really ended up being obsolete because there is a whole new fit and style available. Your tuxedo will just end up looking a little out of place. Now we are not talking dramatic like comparing a light blue 1970s tuxedo with ruffled shirt to a classic black 2 button tuxedo but the look will be quite noticeable.
Your closet or wardrobe if you want to call it that should be checked on at least once a year and you'll want to perhaps purge what is getting long in the tooth with your formal wear or evening wear. See that tuxedo there. If the suit cover on it has a thick layer of dust accumulating. It may be a good idea just to give it to the Goodwill. It has seen better days on you and and it might just be a good idea to get some new mens evening wear and keep your style up to date so you don't end up looking like that guy still sporting the 1980s style hair cut with the clothes to match. Evening if that was your favorite era because you may have been a young man back then. You have long gone out of style with that mullet.