Make a costume from a sheet

Whoops! Maybe I need a larger sheet.

 I'm going to make a costume pattern to sell.  People can buy my plan and make awesome, long, full, scary, ghost costumes.  This scheme will be so simple.  Perhaps I'll get rich! In this activity young students can reason about the potential of a sheet, cut in a very defined circular shape, becoming a Halloween ghost costume. Notions of head diameter, sheet length, "less than" and "greater than" will all come into their reasoning.