Jack/Skins

Jack Customization
A total of 19 heads and 109 skins can be unlocked for Jack.

Default Heads
Heads that come unlocked with Borderlands: The Pre-Sequel to begin customization.

Unlockable Heads (Main Game)
Tradable heads that can be unlocked through game play.

Unlockable Heads (DLC Content)
Tradable heads unlocked through DLC gameplay

Other Heads
Heads unlocked through other means They are account-bound and cannot be traded.

Default Skins
Skins that come unlocked with Borderlands: The Pre-Sequel to begin customization.

Unlockable Skins (Main Game)
Tradable skins unlocked through gameplay.

Unlockable Skins (DLC Content)
Tradable skins unlocked through DLC play

Other Skins
Skins unlocked through other means. They are account-bound and cannot be traded.

Trivia
Note: Needs Link for Ease of Access... aaaaand some proof-reading.
 * Some of the head gears are puns.
 * "Jack" and Jill as in the Children's nursery rhyme. In the nursery rhyme, there is a section "Jack fell down and broke his crown" which can be related to how Handsome Jack fell from power in Borderlands 2.
 * "Jack" of All Trades as a person (or thing) who can do many things but is not "professional" at any of it.
 * "Jack" The Ripper as a reference to a serial killer in the Whitechapel Region of London.