If the suit is uniform, I personally think it is attention to detail. For example, the position of tie, the length of trousers (not suitable for a tailor to cut quickly), the shape of leather shoes, the waxing of toe cap and so on.

This is a solemn ceremony. Personally, it is better to choose black shoes (three-joint Oxford cloth) and white shirt.

As long as the face and hair are neat and fresh.

You can also put away your favorite clothes, and the most important thing is to pay attention to appearance and etiquette.