Should I wear stockings to a formal wedding?

A formal wedding does not require stockings. However if you are not planning to wear stockings to a formal wedding, you should have good-looking legs that have a nice color. If you are wearing a floor length dress stockings are optional. Stockings are not necessary in hot humid weather. Also if you wear toe less shoes or strappy sandals it is not chic to wear nude/neutral color hosiery. Colored hosiery works with closed toe, open toe shoes, or strappy sandals. Stockings give your outfit a more polished look, when wearing a cocktail dress with closed toe pumps or closed toe slingback style shoes, and they keep your legs warm in cold weather.

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Can I wear a linen dress to a September wedding in DC?
Linen is a beautiful, breathable textile and was once considered a summer fabric not worn before Memorial Day or after Labor Day. Things have changed and common sense rules and / or there are no hard and fast rules anymore. September has some very warm temperatures and a linen dress would be on-trend for a wedding. Linens come in different weight fabrics and heavier weight linens are wearable right into late fall. Traditional fall colors such khaki, navy, brown, or black are chic in the fall but wearing a bold color today is very much in style. Style a  linen dress with an animal print bag, pumps or sandals for fall. Bone or metallic ankle shoes would be great in September with a linen dress. Wear your linen dress in September with confidence and enjoy!

Can I wear a crop top to a wedding?
A crop top is a casual top worn on the upper body and cut short revealing the stomach. Not very appropriate for wedding attire. You never wear clothing that takes attention away from a bride on her wedding day. Maybe a teenager or younger person that attends a casual outdoor wedding in the summer or hot climate might be able to get away with a cropped top that is in good taste and does not expose too much skin.