beige dress slacks Men's Slim Fit Pant - and a clean tab Dusk Elasticated Pants - Beige

They might compete with your dress design and leave you looking short-necked if they are too long

Especially if your trousers are light, like khaki or grey

For a royal blue dress, consider how different shades of blue can create harmony or contrast with your outfit

It's quite the look namely, quite the replicatable look, with just the perfect mixture of princess-y class (it doesn't get much more ladylike than pale blue lace) and edge (the bright white sandals, bandeau and hair all add fashion street cred)

This might mean always pairing your black dress with metallic shoes and complementary jewelry, or selecting one statement accessory and keeping everything else understated