Wigs, short-term dyes for the hair underneath and eyebrows, contact lenses that change your eye color, mask to cover the face, costume make-up and prosthetics to add things like cyberware and scars that don't actually exist as well as changing your skin color, special gloves that give you a different set of fingerprints than you actually have, weights in clothing to change body mass, and on occasion voice alteration devices. Having vials of skin, hair, and blood samples from random people to leave behind you to contaminate the scene so they can't use any forensic evidence also helps.
After all, the key to being untraceable is not to leave no evidence, but to leave so much evidence that points to so many sources that they can't use any of it.
It also helps to play with other people's senses. That's where drugs like Bliss and illusion spells are very helpful. After all, if the security guard is describing you as a seven foot blue dog that talks and DNA evidence says the crime was pulled off by forty-seven people while there's only four sets of footprints... It's pretty safe to say they probably won't be able to track you down.