Possible Clues:

• So wearing is one comes to life again, perhaps
• Briefs et al.
• Comes to life once more, perhaps - so wearing below the surface (6)
• Intimate wear, informally
• She has them on when she seems to get lively once more
• Enough to make one come to life again, it seems, and not at all worn on top
• Boxers, for example
• Small drawers?
• How wearing they are if one comes to life again, perhaps
• Comes to life again, perhaps, but not on the surface