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So, what kind of "elimination of the psychological barrier" are you talking about in your previous post? Leaving aside the fact that the things you mentioned are hardly quirks. But someone quiet and uncommunicative, for example, might be ridiculed. Someone who walks a little strangely. Someone whose last name is "funny" (for example, the last name Vagina for a girl).
I assure you, it all depends on the child, but the uniform usually lasts for at least two years. Sometimes even longer. There may be exceptions during puberty, but on average, it's as I said. And, of course, it can be worn for longer.
I'm saying the same thing, that it usually lasts for two years, and then the child may outgrow it. And that's often the case.
p.s. Vagin, by the way, is a very common last name.

В тихой однообразной жизни всегда так бывает: каждый отдельный день бесконечно долог, но месяцы и годы мчатся с непостижимой быстротой.
I wanted to offer you some flowers, but a crown would suit a princess like you much better
Смысл жизни в том, что жизнь на тебе не заканчивается