Still the old-fashioned style of shirt (3)
I believe the answer is:
yet
'still' is the definition.
(yet can mean still or so far)
'old-fashioned style of shirt' is the wordplay.
'old-fashioned style of' becomes 'ye' (I can't explain this - if you can you should give a lot more credence to this answer).
'shirt' becomes 't' (as in a T-shirt).
'ye'+'t'='YET'
'the' is the link.
Can you help me to learn more?
(Other definitions for yet that I've seen before include "'But, however (3)'" , "in spite of that" , "Still; however" , "Still; nevertheless" , "Up to the present time" .)