According to the Popular Mechanics article RFID Credit Cards and Theft: Tech Clinic, the fact that many new credit/debit cards have a RFID chip embedded on it, there is a risk (albeit, small according to the article) that the card would be 'skimmed' - from the article:


  RFID cards do have a unique vulnerability. "Your card can be read surreptitiously. Unless you were paying attention to the guy behind you with a reader, you'd never know you were being skimmed." 


Now, even though the risk is low, there is always a chance.  With that in mind, a friend bought me a wallet - a Stainless Steel RFID Blocking Wallet to be precise, that claims to


  prevents 'accidental' reading of your information 


I have this wallet still (it is rather nice looking), so my question is really two-fold:


Can a steel woven wallet prevent RFID scanning of credit card information?


and


Is there a practical way I can test this myself?


(Note: I have no affiliation with anything to do with the manufacture or sale of these wallets)

Any Faraday cage will do the trick. So a shielding of just about anything conductive, be it aluminum foil, conductive paint, wire mesh, or any of a number of similar alternatives is going to be opaque to radiation. That means no radio waves in or out, which means the RFID signal is blocked.

Note that the size of the mesh has to be significantly smaller than the wavelength in question; RFID specs are mostly in the MHz range but go as high as 2.4GHz, which is about a 10cm wavelength. So your mesh should be just fine. But aluminum foil is cheaper. 
