The Silkied feathering is recessive, so no, breeding a bird that is 1/4 D'Uccle and 3/4 Silkie back to a D'uccle will not create a Silkied bird.
Really, it will take a LONG time to actually get a Silkied D'Uccle, as Silkies have a very different body type, plus you'd need to get rid of the fifth toe, the dark pigmentation, the vaulted skull and crest, and then of course work on the upright body, upright tail, etc.
Remember, Silkies have both silkied feathering alleles. Crossing to a D'Uccle will make offspring with only one allele. Crossing back to the Silkie again will ruin the D'uccle body, but you'll get a 50% chance of Silkied birds. From there, you'd need to work on crossing them back to a half D'Uccle, half Silkie again. And still, you're going to run through a lot of problems with getting rid of the Silkie type.
If you want a mutt with Silkied feathering, you can make that.