Something to Wear for the Rehearsal
The groom and his family are the ones responsible for creating the rehearsal dinner and so this gives them the opportunity especially for the groom to feel like he really is the groom by finding the right attire that will show his good looks.
It is actually easy to find the right attire for the groom since most men are not that meticulous with most of their clothes. But of course keep in mind that the reception dinner is also a big day and dressing to impress should always be the goal.
The formality of the rehearsal dinner and the style of the groom should always be the basis on how to properly dressing up for the rehearsal. Do not forget though to include guests about their attire as well since you do not want some guests wearing informal attire when the event is a formal one.