From Thinkgeek:

Worf. Klingon. Starfleet officer. Friend. Lover. Warrior. Worf is all these things rolled into one; an unusual circumstance breaking molds left and right. So, we thought it was only right to celebrate all that is Worf and give you the hoodie of a true and honorable warrior. This is the Star Trek: The Next Generation Worf Costume Hoodie! Modeled on the two-piece, Robert Blackman uniforms from seasons 3 forward and the Klingon warrior’s sash redesign by Durinda Rice Wood), these hoodies are a ThinkGeek creation and exclusive.

[Star Trek: TNG Chief of Security Worf Costume Hoodie]