The prime minister has revealed that he does not own a onesie, unlike his deputy, but added that he is "jealous" of the ones his children have.
Cameron was asked if he had one of the popular all-in-one leisure suits after Clegg admitted being given one during a radio phone-in last week.
Speaking on ITV's Daybreak, Cameron said he had not joined in with the trend, which has seen grown men and women wearing the romper outfits.
He said: "My children have onesies. I often say that I'm very jealous that they didn't get me one."
Last week Clegg told London's LBC 97.3 radio that he had been given a "big green onesie" in Sheffield but said he had not worn it and it was still in its packaging.