Are other girls now wearing black spandex shorts under their dresses?

Have I missed a new fashion trend here because I am normally on top of it with latest fashion.

Today when I was walking around town I noticed at least 10 other girls wearing black spandex shorts under their dress.

I could only just see them because they were a touch sticking below the dress from behind while they walked. You couldn't tell if they were standing still.

Should I wear some under my dress?
Are other girls now wearing black spandex shorts under their dresses?
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