Newsweek reports:

Palin also used low-level staffers to buy some of the clothes on their credit cards. The McCain campaign found out last week when the aides sought reimbursement. One aide estimated that she spent “tens of thousands” more than the reported $150,000, and that $20,000 to $40,000 went to buy clothes for her husband. Some articles of clothing have apparently been lost. An angry aide characterized the shopping spree as “Wasilla hillbillies looting Neiman Marcus from coast to coast,” and said the truth will eventually come out when the Republican Party audits its books.

Emphasis mine.