A Japanese uniform manufacturer has created a mesh t-shirt from polyethylene fiber that they claim will protect wearers from knife attacks. And while that may certainly be true for slashing cuts, the rather large holes and flexible nature of the material means it won't do much for the quick jabs that form the bulk of my "Ice Pick Mongoose/Mandrake" fighting style, in which I induce a psychomotor seizure with a whiff of video head cleaner and then pull my own hair from its roots while emitting a paralyzing keen, filling both myself and my assailant with dozens of tiny punctures.* Unlike the full body armor (and ear muffs) that might protect a victim from such an attack, the t-shirt from Nihon Uni is machine-washable.
Prices will start at 19,000 yen for a short sleeved version up to 59,000 for a large, long-sleeved version.
* Keep in mind I am not a doctor.