If this is news to you, don't fret: Together with lingerie brand Le Mystère , we've entered the chat with the following guide to seven essential styles you'll need in warm weather, from strapless bras that can go incognito under every open back/confounding neckline imaginable to convertible sports styles for active days. Keep reading to find out which pieces are missing from your lingerie wardrobe (then maybe read up on how to properly launder them ).