In this sentence what's meaning みたのは? So somebody said me that it's meaning "I have got a uniform". But I want know whe (and what is meaning) here there is みたのは？Thanks for your answer!
<テ形> みる means "try (something) and see," and in this sentence の turns the preceding verbal phrase into a noun describing the action, "the time [I] tried (doing something)". は marks this whole thing as the topic of the sentence.
It's not quite "I got a uniform," I don't think, but that's the gist of it; I might say "This is the first time I tried to buy a uniform."
It's probably 買ってみた and not 買て since て-form of 買う is 買って.
[制服を買ってみた] のは [はじめて] です
• 制服: Seifuku (school uniform)
• 買う: Kau (to buy)
• 買ってみた：Tried things then bought it. みた is the past form of 見る。
-> Formula (V-て) + みる(look) : Do something in order to see what will happens / see the result of it (Try)
• のは is particle. The の package [Try uniform and bought it] as a noun, and は marks it as a topic.
• はじめて：Hajimete (The first time)
So it literally means:
About [Trying school uniform and then bought it], this is [the first time].
It is my first time to tried and bought a school uniform.