The singer only dons tiny hotpants and see-through outfits because her partially sighted grandparent finds lighter shades easier to spot.
She told Rolling Stone magazine: "My grandmother is basically blind, but she can make out the lighter parts, like my skin and hair."
"She says, 'I can see you, because you have no pants on.' So I'll continue to wear no pants so that my grandma can see me."
The 22-year-old singer intends on spreading her love of flesh-flashing garments by designing her own clothing line.
Lady GaGa - who recently braved cold UK temperatures in a variety of tiny outfits, including a PVC corset and hotpants - said: "I can't wait to do my own line. It's definitely something I want to do in the next year as I do have my own style."
Her fashion desires already have the support of singer-and-producer Akon.
He said: "People dissed her because of the way she dresses, but she's hot. Everyone wants to look like her. She'll walk around in London in her underwear and you watch, everyone will catch on."
