The 30-year-old reality star said doesn't approve of women wearing new clothes and then returning them now she has her own DASH clothing store.
Speaking on The Tonight Show with Jay Leno, she said: 'It's not right. Now that I own a store, I realise it's probably not the best thing to do.'
She added: 'It's not morally right, so I don't recommend it - but I think everyone's done it.'
Kardashian's new perfume was recently featured on the US version of Donald Trump's Celebrity Apprentice, where stars had to create a display for the fragrance at a Perfumania boutique in Manhattan.