Uniform in Texas is a smart jacket (3)

I believe the answer is:

tux

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'a smart jacket' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'uniform in texas' is the wordplay.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'in' is an insertion indicator.
'texas' becomes 'TX' (abbreviation).
'u' going within 'tx' is 'TUX'.

'is' is the link.

Can you help me to learn more?

(Another definition for tux that I've seen is " Briefly, American dinnerjacket".)

I've seen this clue in The Times.

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