How jazz?
Depending on the occasion I’ll go either old fashioned (white square + white shirt or colour silk tie with matching colour square)
or if it’s more casual I’ll be a bit more along these lines. (I don’t like how absolutist that is personally and think matching definitely has it’s place if you’re being daring, but it makes good points)
I have a really nice pure blue silk tie which I will wear with a yellow pocket square (originally I was actually using a yellow cotton sock, but I now have a proper square)
I personally with a suit like this would stick to a more simple colour, if not just white. I have some nice burgundy, grey and pale blue shirts (as well as a few nice patterned shirts) but I feel with a suit like this it would be over doing it, and it’s better to add colour via the tie and accessories. Whatever makes you feel comfortable and confident is always going to be a winner though!