Some one did a scientific study on belly button fluff. Its all about if you have hair joining your waistband to your belly button.

now for the science bit…

Bits of fabric from your pants migrate up/ or indeed down the hair into your bellybutton.

If you shave the hair round your belly button- no fluff
If you wear nothing on your bottom half- no fluff

Go on lads- give it a go

Never had fluff of any colour there, no hair modifications either. And I wear clothes on my bottom half.

http://www.telegraph.co.uk/news/newstopics/howaboutthat/4883791/Revealed-The-secrets-of-belly-button-fluff.html

Fluff free. But I can hold a Marlboro there when sunbathing.

lynch lint in the local parlance.. got it, have it, always had it.

I’m saving up to make a sweater ( err.. thats a jumper for you lot )

Got it! Big Dummy’s passport!
But no fluff.

No fluff or Dangleberries here sorry

No fluff,one Klingon up the crafty butchers entrance

pierced, fluff free.

having had another look, no belly button.