IIRC, Tom James does (or did) make suits for the US Secret Service guys. They know how to cut the jackets for concealment and add abrasion resistant pieces to increase longevity. You might start there.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .