The burgundy waistcoat continues the broad colour of jacket and trousers in this front crop. A single button column runs below the dark long tie. The white shirt stays visible as a pale frame at the top and cuffs. A small pale yellow-to-green-looking pocket square and a small lapel detail add accents. One hand rests in a pocket. Lower legs and shoes are missing, so the slightly leaning pose is primarily a reference for colour and the inner area, rather than a complete trouser-length or footwear decision.
If this direction appeals, fit your actual candidate without the jacket as well. You can see whether shirt, waistcoat and waistband already create the complete look you want later in your celebration. Then try the intended accent colour in a pocket square and photograph a version without it. The large burgundy surface does not automatically need several additional colour markers. For a shared appearance, you can coordinate a small colour without wearing identical main colours. A complete fitting with shoes supplies missing information before trouser or hem alterations are agreed, and makes the final choice repeatable as a real outfit.