formal long dresses with long sleeves High Couture NR2214 Sleeve Prom Evening Gown A sudden flare of fabric defines the silhouette of the long sleeve lace floral formal dress by LaDivine CD233 Classic Evening Dresses Velvet Long

Stylist Law Roach tracked down Grande's oldest vintage gown yet, which debuted in the 1930s

What's considered appropriate is up to interpretation and the event you're attending, but as a rule of thumb: stick to midis or tea-length dresses that hit just about knee-length

The overall color scheme hadn't been determined at the time the bridesmaids ordered their dresses, so they picked out six swatches from a neutral palette in light, summery tones

Some conventions feature costume competitions and other scheduled costuming events

The fitted yet comfortable silhouette ensures you can wear it all day, from the office to an evening event

Ralisation The Violette in Black & White Spot Stand out in a sea of dresses in this playful polka-dot print style