Consider the budget you would like to spend for the costume. A total makeover for a unique sexy costume does not necessarily require a huge expense and you always have the choice of wearing a sexy Halloween costume even if your budget is tight. And so might your costume be.
If you decide to put your hands off for making a sexy Halloween costume yourself you can always checkout the online stores. Try to seek some helpful costume ideas in the web for there are plenty of them. Make some modifications out of those ideas and create your own. And it would also be even helpful if you visit sites like http://SexyCostumesIdeas.com.