20 Things You Didn't Know About The World Is Not Enough (1999)
4. New Specs
Double-0 Seven’s X-ray sunglasses serve a very practical purpose in the film, allowing him to determine who around him is armed.
He puts them to good use in Valentin Zukovsky’s Casino L’Or Noir in Baku, but an unfortunate side effect is that he can also see underneath people’s top clothes, making them one of the more voyeuristic of Bond gadgets.
In truth, the sunglasses were merely a prop and did not have such fantastic properties. To mimic Bond's vision through the sunglasses, costume designer, Lindy Hemming designed two forms of costumes for the patrons at Zukovsky's casino to wear: their top clothes and then translucent clothes showing all of the weapons that they were carrying.
he two shots were then inlaid over each other during the editing process to make it appear that Bond could see through their clothes.
Naughty, but quite clever!