i would say the easiest is a ghost. there are more easy ones, though, and i will tell them to you. you can make a greek person (like a toga and stuff) or an epyptian person by cutting up sheets and stuff. these are the easiest i know how to make.
Some good homemade halloween costumes could be for one the original witch or even a pumpkin. Easy, fast, and fun! You could also do frankenstein and the bride for couples.
Pink Ladies (from Grease)
Some ideas for great and uncommon Halloween costumes can be gotten from: Topix, Yahoo Answers, Zoogster Costumes, Yandy, Coolest Homemade Costumes, Etsy, Examiner, One Man's Blog.
Santa's Little Helper
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well some of the costumes are homemade some they bought from one of a kind fashion designers...
Check out thrift stores and second hand stores like Goodwill for inexpensive costumes and supplies. MarthaStweart.com also has instructions for homemade Halloween costumes, or you could visit your local library for books on DIY costumes.
It depends on how greatly your skills come along. If you can sew, it is easy as long as you know your personal measurements. If not, you can go to a costume shop and piece together an outfit to make it your own.
Some easy ideas for making a little girl cowboy costume is use brown felt to make the jacket and by using some old jeans will make this costume affordable to. You can even purchase a badge and gun from your local dollar store if you wanted to.
There are some very easy costumes that require little work and are very easy to wear! Here are two websites with some great ideas: http://community.sparknotes.com/2009/10/09/the-easiest-halloween-costumes-ever and http://collegecandy.com/2010/10/25/the-five-easiest-halloween-costumes-ever/.
get dark clothes and sow em in the thing you want it to be
Some easy homemade cake decorations you can use to enhance the presentation of your cake include fresh fruit slices, edible flowers, chocolate shavings, sprinkles, and whipped cream swirls.