Benetton Clothing to Carry RFID Tags
That's true. However, the 1.5m distance is already as optimised as they can get after several years of hard work using wopping great antennas. If you really can get that distance up to 2-3m (let alone 8-10), then I suggest you'd be better off selling your solution to Philips than snooping into your neighbours underwear drawer.
Oh, and most of the RFID tag units are already directional - so just walking past the reader with the tag antenna at rightangles to the reader antenna is probably enough to defeat it.