She probably keeps the stage clothes in the trunk as "proof" to any future IRS investigations over "stage wardrobe expenses".
"See, Mr IRS Agent, I don't wear this crap off-stage...only during concerts & photo shoots" 
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Among God's creations, two, the dog and the guitar, have taken all the sizes and all the shapes in order not to be separated from the man.---Andres Segovia
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