The dark pocket square has small pale motifs against a burgundy jacket and black rollneck. No tie appears in this visible combination. The dark neck area and small square therefore remain two closely related accents beside the broad burgundy fabric. A watch is visible, with one hand near the jacket and the other hanging at the side. Legs are staggered and cropped below. The photograph is principally a comparison of collar and breast pocket, rather than a full trouser-hem or footwear reference, and its close framing gives the small pattern particular prominence.
Use it when considering a square without a tie. Try a largely plain dark piece on the same rollneck first, followed by a small pattern. Decide whether you want only the dark connection or the pale motifs too. A higher fold reveals more pattern; a lower position can reduce it to a narrow corner. The square does not need to become the largest visible accent on the upper body. Photograph your actual combination with relaxed arms so the hand beside the lapel does not determine the final shape.