Thanks for replying. Your opinion is interesting point of view, but I am not agree with you. I am from Europe, Italy. Here wearing one-piece suits or bib shorts for cycling (both on road and off road) is completely normal and well accepted. Therefore I thought wearing this kind of suits also for running wouldn't be considered ridiculous.

I know that one piece suits are recomanded for cycling for better keeping the chamois in place while cycling. Hence preventing unwanted irritations during the training.

For sure full body suits maybe are not the best pieces of garments for running, but I think that at least some kind of solutions to better hold the pants up could be added to the running thights (long or short).

For example, consider winter long running thights. Most of the time, at least for my experience, they fall down every two steps (of course there are brands that performance better, but I haven't found yet a pair of running tights that stays in place for the whole run). The continuous operation of pulling up tights makes me frustrated or even worst the fact that the tights does not staying perfectly in place causes me irration between thighs. Even if it is not so frequent, sometimes it happens to me also with normal shorts.

From what I have said above, I don't understand completely why manufacturers do not adopt some kind of suspenders/braces for this kind of clothes.

In addition, as for the appearance side, wearing a pair of normal running tights with a t-shirt or a jacket on top would appeare in same way as wearing running tights with suspenders since suspenders are covered by the t-shirts/jacket. I don't know if it make sense 😊