The navy waistcoat continues the jacket colour towards a dark long tie. A white shirt creates a clear upper frame, with small dark buttons visible on the waistcoat. Both hands grasp the jacket edges near the waist. No protruding pocket square is clearly visible. This makes a restrained countercomparison: shirt, tie and waistcoat edges already divide the centre without another coloured pocket accent occupying the upper area. The observation does not establish an empty pocket or product feature; it describes the visible front and should be compared with your own garment in its ordinary stance.
Photograph your outfit without a square first, even if you are considering one. Add a small pale corner next and compare from the same distance. Ask whether you want the extra brightness or prefer the quiet navy area. Release the jacket edges in both views to see its natural drape. A square may be useful but is not necessary to complete the look. Check the real jacket closed too if relevant, because the visible distance between pocket and tie changes. Keep shirt and waistcoat unchanged so the contribution stays clear.