There I fixed it for you.^ Both the Rapiscan and the L3 cannot see through leather, being much more dense than skin. They WILL see the leather, but nothing beyond. Check it out yourself.

However, foil and conductive fabrics will completely foil the L3 (but not the Rapiscan), as the microwave cannot penetrate and will reflect back 100%. This would make more comfortable anti-ait clothes, as soon as they outlaw the "Walls of Cancerous Death" machines for their cancer-causing qualities.

Either way, you're gonna get the frank and bean massage, but probably not for long.