The 'Bad Romance' singer is said to be "in love" with silk and will only wear items made of the fabric.
"She's so in love with the way it feels on her body, she's demanded every piece of lingerie be made from 100 per cent pure silk," a source told Now magazine.
"Polyester, cotton and Lycra are all banned. The finest silk, made to order, is all she'll wear now."
GaGa allegedly believes that the clothing will help to inspire her creatively.
"She really believes this will help her creativity because if she feels comfortable and her skin is able to breathe properly, she'll be able to concentrate on her music," the insider explained.
"She's taking this latest fetish seriously and driving her assistant crazy. Some garments go for £70 a pair and because she's kitted out the entire underwear section of her wardrobe, it's cost her close to £7,000."
