I am a seminarian, and I voted no.
At my seminary, only Deacons (and priest obviously) are allowed to wear clericals. There’s one exception I guess, and that’s if one of the guys is MCing a Mass (outside of the Seminary), then they usually wear a cassock and surplus.
One of the underlying impressions that never gets spoken of with this question is motivation. The desire amongst some seminarians to wear clericals sometimes (not always, but I have seen it) goes with a latent (or even outright) clericalism. The attitude is usually something like “Look at us, we’re different than you”, even though when you are not ordained you really aren’t even finished your discernment yet and you are in the exact same state of life as any other layperson (not including consecrated religious, they are in a different state of life).
I’ve seen this myself amongst seminarians who like to think of themselves as belonging to some kind of non-existent “laity+” state of life. The priesthood itself is fundamentally a vocation of service to others, not of any sort of privilege (despite how much some people, including some seminarians, would like it to be).