There are many a manager in The Premiership / Championship who are never seen in a tie and jacket. How long has it been de riguer?
There's probably a mixture of suits vs tracksuit managers. Then there's managers like Schuey and Lowe, who go for the smart casual look.
Then there's Ainsworth, who dresses like he's in a dad rock band. It certainly adds to his character, but there's got to be a reason why a manager who has done such a good job at a small club is still with that club after 10 years. Especially considering the turnover of managers in the EFL.
Anyone displaying even a modicum of ability is generally poached pretty sharpish - Ryan Lowe has already moved on twice in his short managerial career, Rob Edwards left Forest Green for Watford after a single season, Ian Evatt was poached by Bolton after two seasons at Barrow. There are loads of similar examples.
Yet Ainsworth is still at Wycombe after a decade. Maybe it's his style of football but I doubt it. Football is a results business and he gets them.