Of the many ways guests can ruin a wedding, showing up in a white dress ranks high on the list. But this surprisingly common mistake isn't the only fashion faux pas wedding guests are making.
With the start of wedding season here, INSIDER spoke with New York City-based planner Amy Shey Jacobs of Chandelier Events to find out exactly what guests should avoid wearing.
Here are the worst things you could possibly wear.
A white dress

Despite it being a common tradition for the bride to wear white on her wedding day, some guests really do turn up to weddings in white dresses.
Other bridal colors and styles of dresses are also out of the question.
"If it could be a wedding dress, it shouldn't be on your body unless you're the bride," Jacobs told INSIDER. "Avoid anything white. Same goes for creme, light beige, off white, eggshell ... and especially white lace."
There's only one exception to this rule: You can wear it only if the bride has explicitly said guests can wear white. In Jacobs' words, "If you are told to wear white (like to a snowball affair or white party), wear it!"
The same color as the bridesmaids

Dressing like the bride is one problem; dressing like a bridesmaid is another.
"If you actually know what the bridesmaids are wearing, and YOU'RE not a bridesmaid, try to avoid looking like a member of the bridal party," Jacobs said. "Don't overthink it, and certainly don't bother the bride, but if you're sure that the bridesmaids are all wearing pink chiffon, maybe go for gray instead."
Denim

"Unless its a Denim and Diamonds dress code, denim is pretty much an unwelcome guest at a wedding," Jacobs said. "This doesn't mean that pants or a jumpsuit are off the table, but it's best to leave your jeans at home."
There's perhaps one exception to the rule. The wedding planner suggests the only acceptable way to wear denim to a more casual wedding is if you opt for a smart outfit, like this elegant dark denim dress from Neiman Marcus.
If you're not sure, just don't wear it.
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