Ms. Thomson's solution: a shaper slip without the kind of elastic waistband that could cause bulges a dance partner might feel.

WSJ: Pull On the Right Shapewear

Suddenly that itty bitty weight gain has taken you from a slightly tighter fit in your favorite jeans to the point of considering, gasp, an elastic waistband.

CNN: Don't surrender to holiday pounds

Until recently, there was some question whether the enzyme sensor solution would handle the stresses of daily life, so to speak, but these briefs were up to the task -- subjected to a torturous gauntlet of bending and stretching, a treated elastic waistband was still able to adequately measure chemicals as required.

ENGADGET: Scientists create sweat-monitoring underwear, break them in (video)