She mocked it, but she still wore it. :-) (And she also asked if Riley had a jetpack for her, which may foreshadow 'Seeing Red'). And in 'No Future For You' she's still got quite a light-hearted attitude to all the fancy military hardware, with jokes about sonar and man-frogs in the moat.

'My' Buffy wears the military gear on missions to set a good example to the younger Slayers, because she knows it might save their lives and she doesn't want them to get careless. If she ever managed to slip off alone to wander through a graveyard for old times' sake, I suspect she might wear something more like her old outfits.