The customer reviews
The customer size rating bar
The sizing videos
The material of the costume
The description and quick facts tab
"I would recommend the larger size, because you can always have it taken in."
"You should definitely get the medium size."
"I'm not quite sure, but maybe you could check out the size chart."
"I'm going to guess that you are probably a size small."
Guess at the size they might wear
Suggest that they do a Google search for an international size conversion chart or suggest: http://www.onlineconversion.com/clothing.htm.
Make something up
Inform them that unfortunately, you cannot help them.
Just below the price.
Just above the quantity.
Just to the right of the size.
Just to the left of the picture of the product.
To order the larger size
Our exchange program
To order the smaller size
To order both sizes and return the one that does not fit.
To the right of the quantity
Below the sizes listed
Directly below the product ID #
Above the price