The French clothing brand Cremieux, known for its preppy, brightly colored men’s attire, has opened its first boutique stateside, in New York’s SoHo neighborhood. The two-level space is the exclusive home to the brand’s first-ever American-made designs, which include velvet loafers ($495), hand-knit pocket squares ($95), and ties ($115). The new store also carries Cremieux’s line of European-made cotton sweaters (from $170), lightweight cotton jackets (from $435), and dress shirts (from $160). Many items are a…