When evaluating silk tops, the most critical factor is the Momme weight (mm), which measures the density of the silk. For tops, a range of 16mm to 22mm is ideal; anything lower may be too sheer or fragile, while higher weights are typically reserved for bedding. Additionally, verify the grade of the silk, with 6A grade being the highest quality in terms of fiber length, strength, and uniform color. Pay close attention to the weave type, such as Silk Charmeuse for a high-gloss finish or Silk Crepe de Chine for a matte, pebble-textured surface that resists wrinkles.