You want to look good for your wedding so it only makes sense that your guest do too. However, what can you do to help them? Providing them a mood board or a Pinterest board isn't a good idea. Trust me. So how do you ensure your guests dress accordingly and is comfortable at your wedding?
ADVISE OF THE FORMALITY OF THE WEDDING
This can be implied through the style of your wedding invitation or stated explicitly in your invitation, reception card, or wedding website. It is ok to tell your guests if the event is black tie optional, white tie, semi formal or dressy casual. Some of your guest might not know what these terms mean but at least you have given them something to google or search on Pinterest. All of them will appreciate the information and guidance. It can be extremely uncomfortable to attend an event under/over dressed.
ADVISE OF THE POSSIBLE WEATHER CONDITIONS
Your guests won't expect an accurate weather prediction but some general ideas on weather is nice information to share. You can tell your guests what the weather is like generally at this time, what to expect, and how they can be prepared (like bring a jacket or umbrella.)
ADVISE IF THE CEREMONY OR RECEPTION WILL BE OUTSIDE
This is important information to relay not only because of the aforementioned weather concerns, but footwear as well. For weddings held in a grassy area, it's wise to warn women against wearing stilettos and to include a link to some great heel stoppers you'd recommend if they decide to do so. For guests that are generally cold, they will know to bring a shawl or jacket with them. Pretty much, you are giving your guests the facts so they can prepare themselves accordingly for an enjoyable day/evening.
ADVISE OF SPECIAL RESTRICTIONS
If your venue has special restrictions, such as men must wear a jacket and tie to gain entry and ladies cannot wear stiletto heels inside venue to protect historic floors. You must tell your guests. The absolute worst thing that can happen is having your guests being turned away at your wedding for things that could have been avoided.