How can I find out how much to deduct on my taxes for a contribution of used clothing?

Individual taxpayers in the United States are faced with a choice when preparing their tax returns. Starting with their AGI (adjusted gross income), they can itemize their deductions (from a list of allowable items) and subtract the total from their AGI (and any applicable personal exemptions) to arrive at their taxable income. Alternately, they can elect to subtract the standard deduction for their filing status (and any applicable personal exemptions) to arrive at their taxable income.