For really formal weddings, they'll usually spell it out for you in the bottom right corner. Make sure to check if there is a specific dress code on the invitation and then dress appropriately. A friend of mine managed to miss on his invitation that the dress code was black tie, and was the only person to show up in a regular suit - how embarrassing.
But if your friends or family members weren't super specific about the dress code, you can still learn a lot from the location, time of day, and style of the invitation.
I'm going to be doing a series over the next couple of weeks on what to wear to a wedding based on the invitation. Stay tuned!

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