A piece of silk fabric.
A piece of white fabric.
It's very simple: just wrap the egg in the silk, then wrap it again in the white fabric. Wrap the egg/fabric up tight with twist ties, then add it to boiling water and vinegar! After a few minutes, take the eggs out and let them cool, then you're done!
It's important that it's 100% silk! Old ties or handkerchiefs work really well. Just make sure to use silk that you dont't mind getting ruined - do some thrift store searching! You'll be absolutely blown away by the results!