Fabric quality: A good quality suit will be made from high-quality fabrics such as wool or cashmere. You can check the label to see what materials the suit is made from and examine the fabric to make sure it is soft and supple.
Fit: A well-made suit should fit perfectly, with no wrinkles, bulges or bagginess. The shoulders should be snug but not tight, the sleeves should fall at the wrist bone, and the jacket should button easily without pulling or gaping.
Details: A well-made suit will have carefully crafted details such as functioning buttonholes, pick-stitching along the lapel and pockets, and reinforced seams. These details show that the suit was made with care and attention to detail.
Lining and interlining: The lining and interlining of a suit can make a big difference in its overall quality. A high-quality suit will have half or full canvas interlining, which provides structure and helps the jacket keep its shape over time.
Craftsmanship: Look for signs of skilled craftsmanship such as neat and even stitching, clean finishing, and well-aligned patterns on the fabric.
Brand reputation: Finally, consider the reputation of the brand that makes the suit. Brands with a long history of quality and craftsmanship are more likely to produce well-made suits than newer or less-established brands.