• Wig - £15.
• Dress - £18.
• White tights - £2.
• White gloves - £4.
• Red rhinestone glasses - £3.
• Heeled shoes - £13.
• Unicorn horn - (made from resources I already had, but I'd estimate about £2 worth).
Everything was bought, apart from the unicorn horn. The horn is made from model magic, spun into a spiral shape and then coated with white thread to conceal impurities or gaps. The bottom is white felt, which I've glued onto it and hidden the edges with more thread - this attaches to purple thread which I tie into the wig.
A few things are off-white rather than white, but it doesn't matter too much in the light. Skirt a little bit short, but my tights cover up well enough.