Yes and no, it depends,
Normally, the higher the momme weight, the more durable the weave, the more luxurious the fabric is, the more suitable it is for heavy duty use. Generally, the heavier the silk, the more opaque it becomes. This can vary between the same kind of silk. If you want to transparent fabric, it would be better to use under 10mm silk fabrics. For the silk fabric over 30mm, which is not suitable for silk sleepwear for night.