A study in contrast.
An ivory polo. Charcoal trousers. A jacket close at hand. The same pieces, with a few small changes.

At the neck.
Leave the top of the collar open so the contrasting inner edge remains visible. Keep the layer beneath simple; the neckline already gives the eye somewhere to rest.
At the waist.
A small tuck at the front draws attention to the trouser line. Letting the hem fall changes that proportion. Try both with the trousers you already wear.
At the sleeve.
Push the sleeve back slightly and let the cuff sit on its own. If you add a jacket, wear it open so the contrast at the neck still carries through.

