Short answer
Wear a well-fitted suit in a structured fabric like wool, with a single-breasted jacket and flat-front trousers. Avoid baggy clothes and very shiny materials. A good tailor is your best friend.
For a plus size groom, the goal is a suit that fits properly and makes you feel confident. Many shops now offer a wide range of sizes, but the key is tailoring. A jacket that fits across the shoulders and chest, with sleeves that end at the wrist, will look sharp. Choose a single-breasted jacket with two or three buttons, and avoid double-breasted styles if you prefer a cleaner line. Flat-front trousers with a slight taper look modern and avoid extra bulk. Structured fabrics like wool or a wool blend hold their shape and feel comfortable. Dark colours such as navy, charcoal or black are flattering and timeless. Avoid very shiny fabrics, which can draw attention, and avoid overly tight clothes, which can feel restrictive. A waistcoat can work, but only if it fits well and does not pull. If you are unsure, ask a tailor for advice on proportions. You might also consider a three-piece suit with a slightly longer jacket for a classic look. The most important thing is comfort and ease of movement, so you can dance, sit and greet guests without worry. Many brands now offer made-to-measure services that can accommodate your measurements exactly, so you are not limited to off-the-peg options.
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