The final look for adapting the formal suit is the cocktail-ready, semi-formal party ensemble.
If it looks suspiciously similar to the previous look, that's because it is - minus the tie. The monochrome palette is kept, but the rigidity of a necktie is cast aside for an open-shirt look that is far more sensually inviting.
The waistcoat is kept for an interesting texture difference and the pocket square to maintain flair and not reduce the look to a basic, post-work flake-out.
Velvet waistcoat - H&M
Shirt - Hawes & Curtis
Pocket square - Tie Rack
Shoes - Zara