Taylor Swift's posture-correcting bra costs $185. A posture historian shares why she's skeptical of 'one-size-fits-all' solutions.

• While rehearsing for the Eras tour, Taylor Swift wore the $185 posture-correcting Forme Power Bra.
• The bra is designed to "immediately improve upper body alignment" and fix your posture.
• Beth Linker, author of "Slouch: Posture Panic in Modern America," is skeptical of such products.

It appears that even global pop stars may have a hard time standing up straight.