The dress rules of beauty pageants are the same as for a friend's wedding: dress well enough to show respect, but not so glamorous that you draw everyone's attention.
Simple classification for attire at a beauty pageant, at a small regional event, is semi-formal. At a national competition, the dress code will often be formal.
The expected dress code will also be partially determined by the time of day. If the event will take place at night, it will be more formal than one that takes place during the day.

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Semi-formal attire
Semi-formal attire is classified as one less formal than formal and above business attire.
There's a fine line that divides semi-formal attire from cocktail-appropriate attire. The type of pageant that requires semi-formal attire will be a local pageant or a regional pageant held during the day. Women should wear elegant high heels, strappy sandals, or flats.

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Formal dress for the day
Formal day and evening attire differ mainly in colors. Formal daytime attire includes fresh colors, such as blue, green, and purple, also pink and pastel tones.
All jewelry and accessories should match the color palette you have chosen for your pageant gowns.
Another distinction to make between day and night is the length of the dress. You can wear knee-length dress for daytime attire. You can wear jewelry to add sparkle, and strappy shoes are appropriate.
Formal attire for an event held at night should be very similar to that during the day, except that the colors should be warmer.
A good color palette for the evening includes warm and dark tones. Red is a very pretty color for the night, along with black. Dark greens and blues are also suitable, or gold and silver.
Women should wear floor-length dresses and high-heeled shoes. You can complete the outfit with a shawl, to give it more warmth and style.

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