Hey! That is some ingenuity right there.

The picture looks like it was taken at a NASCAR race. My guess would be she has been bragging to her friends about how smart she was:

"You know wut. It was gad damned hot at Daytona. I looked at gettin' me a 'Little E' tank top, but they wanted 21 dollars for the thang! I said screw that 'Earl, run in that porta-potty over there and take off your drawers'. I cut out Earl's butt tracks with my pocket knife. Earl got chaffed sumthin fierce from walkin' around all day in hims cutoffs without no draws on. To make up for it I wore my new tank top like crotchless draws for him back at the Travelodge."