This is Zion normal biosuit uniform created by shirokuma. Chibi version is always nice
Yeah that’s not much info about this suit other than it’s a Gundam Pilot suit.
Most prominently seen wore by Yajima Nills or Nills Nielsen. He is a supporting character in Gundam Build Fighters and Gundam Build Fighters Try.
In my opinion, both is one of the worst Gundam anime series were made. During those time new designs of Gunpla were ugly. I didn’t buy any Gundam from that series back then.
SD Zion Normal Suit papercraft is quite easy to make. Suitable for beginner.