Poor hosiery clothes kings in old UK region (9)

I believe the answer is:

yorkshire

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'region' is the definition.
(I have seen 'Northern region ' mean 'yorkshire' so perhaps 'region' could also mean 'yorkshire')

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for yorkshire that I've seen before include "English county noted for relish and pudding with beef" , "Sort of pudding" , "Grit" , "County (with small terrier?)" , "Largest English county until 1974" .)

I've seen this clue in The Sun.

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