The individual has chosen a blue/gray dress shirt with a spread collar. The pocket square is a simple puff (one of my favorites). The jacket is a two button model with a throat latch.
Cuff links are also added as an accessory. Some believe you should not wear cuff links with an odd jacket. I do not follow this assumption, and I believe a casual link looks good with a casual jacket. The golfing theme on these links give them a casual appearance that match the jacket. A set of gold links with intials on display would have been too dressy, and those are better saved for suits.
One more look!