You can find plenty of headdresses for Lolita Fashion in this collection. 

Including the classical hairband(usually a rectangular fabric decorated with lace or bows and can be tied around the head with a ribbon),
KC(headband with a big bow, also known as Alice Bow), hair clips(usually with mini-bows or anything else),
tophats, mini-tophats, mini-crowns/Tiara, straw hats, mini straw hats, Berets, Hanamaru(flower ball hair clips), veil, and some loliable hairpins or hair ropes.

All kinds of styles like classic, sweet, punk, gothic lolita hair accessories, ... even cat ear lolita headpieces are available here.