When evaluating jacket quality, prioritize fabric composition and weight (e.g., GSM for fleece or denier for nylon). For outdoor or workwear jackets, ensure a Waterproof Rating of at least 5,000mm to 10,000mm and a Breathability Rating (MVP) of 3,000g/m²/24h or higher. Pay close attention to seam construction; high-quality items should feature taped or heat-sealed seams to prevent leakage. Additionally, verify the brand of hardware used, such as YKK zippers or Duraflex buckles, as these significantly impact the product's lifespan.