I'm still near the beginning of my classic menswear journey, which may explain why I'm puzzled by something I see at many menswear sites (such as Spier and Mackay, Pini Parma, Natalino, and so forth), namely, trousers that I think of as fairly causal but that feature side adjusters instead of belt loops. I have in mind things such as chinos, corduroys, more causal linen trousers, and the like. Wearing casual trousers like these without a belt seems jarring to me, much as a double-breasted jacket without a tie seems somewhat jarring. With chinos and corduroys especially my eye expects something contrasting at the waist. Is this an unusual (or just untutored) reaction?