Strip poker removes kits - how is that ladylike? (6)

I believe the answer is:

proper

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'that ladylike?' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for proper that I've seen before include "Fitting and correct" , "Genuine; part of church service" , "Right, correct or appropriate" , "Appropriate according to rules" , "Appropiate, right" .)

I've seen this clue in the Irish Times.

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