A devil is a classic Halloween outfit, perfect for wowing guys and staying in the HALLOWEEN spirit too.
Steps
Try to get a more interesting outfit than just a plain devil, you can make it modern, or medieval. Try reading some devil stories to get some new ideas.
First of all get something for the bottom half. Red tights and a red and/or black miniskirt is perfect. If you are more of a tomboy and all try some red jeans or leggings.
For a tail it's really easy to buy one in the shops so no worries there!
If you want to look a bit girly and all you could wear some red/black heeled shoes or red/black boots. If you're more of a tomboy try some Gothic converse trainers.
for your top try a RED dress top or a RED silk sleeveless top or a plain red t-shirt.
next you'll need devil horns. Again you can buy them from the supermarket anywhere.
The make up is the last step here. First or all you will need either red or black lipstick. Your face needs to look pale and lifeless (a bit like a vampire's actually) It emphasizes the red and black. Dark eye make up is the key here ladies. Mascara, eye liner... you name it!
Tips
You've got the costume covered but know one will be scared or affected by your devil beauty if you don't act like one. The devil is lying, deceitful and gorgeous. Try wiggling your hips slightly when you walk but don't make it obvious otherwise you will look like an idiot. Talk to people like an evil mastermind talks to people and smile only when absolutely necessary even then it must be sinister.