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Later Grace, who lives in Scotland, privately shared the picture with her friends on Facebook

We recommend avoiding styles with busy patterns or bright colors

What you'll need: Black Satin Midi Dress, $20, Boohoo SHOP HERE Kelsey is Seventeen.com's fashion expert and resident Harry Potter nerd

Simply delightful, this short black semi-formal dress features a sheer beaded sweetheart bodice with banded sleeves that drape over the upper arms for a sweet look at homecoming, sweet-16 parties, and other fancy events

Or swap the t-shirt for a dress shirt, or keep the dress shirt and throw a blazer over it