Opaque tights - what is the highest denier that you can get but still be y!?

Tights can believe it or not, go up to 900 Den, I have some, also 400, and 200. Generally, I think you want tights that don't look like an old sweater. try 80-120 den, and make surethe fabric is nylon/lycra. check shapings.com, mytights.com. Also, get a size bigger than what you have, the bigger the size, the more opaque it would be because your not stretching the material so much where it becomes see thru, but make sure they will still fit well and not roll down.