ladies underwear

[Tofu]

Hello Alan, Mister Micawber, Beeesneees, Mordant, Esl_Expert and other native English speakers,

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http://tinyurl.com/237bxqb
Socks, gloves, ladies underwear -- almost anything left unattended was fair game for the thief, especially the knickers, and the rate of offending was getting worse.
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Isn't "ladies' underwear" correct?

[Beeesneees]

'Ladies underwear' is a kind of category of clothing in its own right, so is often used without the apostrophe like that.
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Cheers m' dears!