Now, you don’t really suppose, do you, that the Carmelites leave their habits on when taking a shower or bathing, do you? Or even when sleeping, for that matter.
Scapulars and the like are not magic charms that loose their magic when you take them off, nor do they become charged with mysterious energy when you put them on.
A religious habit is just clothing, and by it’s peculiar design a symbol of affiliation. It’s a mistake to attach more meaning to such things than they actually have.
I really don’t think God cares if any person ever wore it for so much as a moment, especially those persons who weren’t Carmelites. Couture really doesn’t seem to be the Almighty’s principal concern. If an individual is in the state of grace at the moment of death, he will be welcomed into everlasting beatitude, regardless of anything he may or may not be wearing. And if that same individual, wearing the scapular or even the full Carmelite habit, is an unrepentant Satanist, he’s probably taking the down elevator, despite what he’s wearing.