Well, by definition, placebo effect means it does provide beneficial effects but not attributed to the properties of the placebo itself (drugs, socks, procedures) and must therefore be due to the patient’s belief in that treatment. Now, placebo effect experiments can be done in drugs with actually no medical content but the patient doesn’t know it has no content. It can’t be done with compression socks. That’s why I said to say it is due to placebo effect you’d have to think that you are wearing them when you are actually not, which can’t be done.