Woman & Home on MSN: Kate Middleton loves her belted pink midi dress - and this dusty blue frock is giving me deja vu Kate Middleton loves her belted pink midi dress - and this dusty blue frock is giving me deja vu When you call something dusty, it's either literally covered in dust or so old and unoriginal that it might as well be. You can use a feather duster to clean off dusty surfaces, but if something is a dusty color, that just means it's got a grayish tint to it, like dusty pink or dusty blue. Vogue: Why One Bride Made Her Entire Wedding Dress the “Something Blue”