Dress for the Weather
Choose a wedding dress that is light and airy and not too closely fitted - tight clothing and hot weather do not mix well.
Make sure that the fabric will not show perspiration stains (do you really want your grandchildren pointing them out in your wedding photographs?).
Choosing natural fabrics such as cotton or silk helps enormously since they will breath and are naturally cooler in hot weather. Synthetic fabrics tend to prevent moisture evaporation, though there are newer synthetic fabrics that handle this rather well.
Put Your Best Foot Forward
Your footwear is just as important as your clothes. Comfort is important, though trainers may be overdoing it somewhat! If you will be walking on sand, unpaved pathways or on cobbled streets, three inch heels will be your undoing! Wear something relatively flat and open, strappy sandals often work very well.
Bear in mind also if you buy your shoes in a country with a colder climate that your feet will swell at least a little when you are in a warmer place. If they are tight at home they will simply be too small once you arrive at your destination.
If your wedding will be on a beach, consider going barefoot (make sure your feet are lovely!), as any heels are difficult on sand. Alternatively have a carpet laid over the sand for you to walk on.
Keep Your Guests in the Picture
Let any wedding guests know well in advance what the weather will be like and what sort of dress will be appropriate and comfortable.
Dressing Men for the Heat
Asking the groom or groomsmen to wear a morning suit or any similarly heavy clothing in a hot climate is plain and simple cruelty! Instead go for beautifully tailored shirts, but loose fitting and in natural fabrics.
They should also wear a light cotton vest or t-shirt beneath the shirt. It may seem illogical to add an extra layer, but the vest will absorb moisture and prevent shirt-stuck-to-back syndrome - not a good look!