My daughter got married last summer. The groom and groomsmen all wore matching gray suits that they all bought. Both fathers wear asked to just wear a gray suit that they already owned. This way all the guys had suits that they can wear for a few years and no one wasted money on a Tux they only wear once.
It's called trying to help the people in your wedding so they don't have to spend so much money. The bridesmaids all picked their own dress style they just had be the color my daughter had picked. Jewel tone purple. It all looked really nice.