While this may be a safe option for a costume starting with A, it is certainly a fun one to dress up in. Here at CostumeBox, we have a great selection of Alice in Wonderland costumes for all ages that’ll have you sipping on tea with the Mad Hatter in no time.

Sir Austin Danger Powers is a flamboyant and hilarious British spy who would make a great idea for costumes starting with A. His crushed velvet suits and thick-rimmed glasses make his vibrant personal style a shagadelic choice for a letter A costume party.

For an out of this world letter A party costume, you can’t go wrong with an alien or astronaut inspired costume. Within our space and aliens collection, you’ll be able to find all sorts of alien costumes from shiny to spooky to your classic green alien, as well as astronaut costumes to match.

If you’re looking for a superhero inspired letter A costume, look no further than Antman. Antman is an ex-convict turned superhero who comes across the power to shrink himself to the size of an insect and would make for an awesome costume starting with A. Browse our Antman collection to find yours.

If you’re after a letter A costume idea for groups, why not go as Swedish pop supergroup ABBA. The four members, and their often outrageously flamboyant outfits, are instantly recognisable and will be sure to have you best dressed at your letter A costume party.

Perhaps you’re after a letter A costume that will send shivers down the spine of your guests? Then an Annabelle costume is the one for you. The Conjuring and Annabelle horror film series tells the story of a possessed doll wreaking havoc on a family. Within our letter A costume category you’ll be able to find several Annabelle inspired costumes sure to give anyone a fright.

If you’re sweet and innocent and can do no wrong, then why not dress as an angel for your letter A costume party. An angel costume is one of the easiest to put together, simply grab yourself a halo and some wings and you’re good to go. Or, why not go all out and add an all white outfit, a white wig and some glitter to resemble your heavenly shine.