A grey checked three-piece combines a patterned jacket and waistcoat with a pale blue shirt in this reference. The collar is buttoned to the top and the hands are at the trouser pockets. The view makes the central layering clear but does not show the complete shoes and hem relationship. The check supplies an existing visual rhythm; another strongly patterned accessory is an optional choice rather than a requirement.
Try a comparable outfit with two shirts while keeping the suit pieces and shoes unchanged. Look at how each neckline divides the visible waistcoat area. If you want a tie, add it afterwards and compare the resulting line. The photographed shirt arrangement does not establish your invitation’s requirements, so settle any stated dress-code question separately.
Sit and inspect where waistcoat and trouser waistband meet, then compare without the jacket. Ask about the actual waistcoat back as well as its front pattern. You can like the repeated grey arrangement while choosing a simpler accessory combination. Describe that preference precisely instead of adding every item commonly associated with a retro-inspired look.