A suit look with coat and waistcoat draws attention to several nested edges here. The brown coat stays open over a grey patterned waistcoat, pale shirt and dark tie. Glasses hang at the front centre. The visible surface supports a pattern description but cannot establish a fibre. A complete jacket underneath the coat cannot be confirmed from this crop either.
For your own outfit, first decide whether you want the waistcoat this visible when the coat is open. Put the outer garment over the actual intended pieces and move your arms forwards. Compare the closed arrangement as well. The visible boundaries around neck and chest may change substantially. Include the coat in a real trial rather than adding it only in your imagination after choosing the suit.
Hands in pockets and the close crop limit assessment of the whole fit. Stand neutrally at your fitting and inspect trousers and shoes in a complete view. Borrow the colour and layering idea without deriving an origin, period or special production route from this photograph.