Vests in Australia?

It can get cold in Sydney in certain times of the year, and in that case I will whip out the old North Face bad boy.

However, don't be that pleb that wears a vest on a 30 degree day in November 

Throw on that gilet and slam down a frother

Much more jackets - Macpac and Kathmandu are the local favourites, with Patagonia, North Face etc. also getting some love. Vests seem less common. I'd say a lot of IB has people wearing suits to the office as during summer, spring and autumn you don't need a vest. During winter my office typically wear coats so those work as well.

They're becoming more and more common these days - have seen Barrenjoey, Jefferies, UBS and GS with their own iterations of the fabled midtown uniform, however by and large IB and CB in Australia are still fairly suit-dense, albeit with no requirement for a tie these days (outside of Jefferies which may think differently as a result of Mr Stock's leadership - famously requiring ties for bankers at CS in 2017).

Very few banks have their own vests made, with a lot of people just buying from patagonia/north face.