Little Clowns - suits, wooly wigs, ruffled cuffs and little hats. This adorable outfit is £32.05 from My Purple Princess Shop.
Next up is this gorgeous rainbow tutu and clown-hat set at only £21.83 from Pampered Paisley.
Keeping with the rainbow theme, check out this set from Bailynn BouNique - £35.65.
And what better to team a rainbow tutu with than a mini top-hat fascinator on a comfy headband? - £16.93 from Little Lady Accessory. If you fancy trying your hand at one of these but don't feel up to the top hat, Tiger often sell mini top-hats for a few pounds.
We absolutely love the outfits at Juju's Tutus - the acrobat tutu costs £33.25, and the ringmaster set is £42.32.
For the top-end of children's costumes, head over to Ella Dynae - these beautiful photos show just how magical a great costume can look and the effect is all in the details. These are not off-the-rail princess dresses from the supermarket but real works of craftsmanship (though at £163.26 a set they may be better as inspiration than reality!)
Finally, if you're looking to buy something from Etsy but don't want the cost of postage from the US - or the nerve-wracking wait to see if your costume arrives before the event - here are a couple of UK sellers. Wild Thing Dresses are really charming. If I had a little girl I would definitely have a whole wardrobe of these by now. This retro lion dress is £44.14.
For a gender-neutral Lion option, how about this Lion Onesie from The Tinker's Taylor (£30)?
And last but not least, here are a few mummy-suggestions - clown outfits from Batcakes Couture (first set £37.97, second set £105.82).
Another inspiration piece with a £241.87 price-tag, this clown set from La Petite Menagerie is to die for.