I believe his is Cornelius or Galen from this set and I believe the clothes are from one of the astronauts in the collection but that’s what was on the figure when I found it

The Soldier Ape 8" Planet of the Apes 1974 Mego Action Figure is a vintage collectible from the classic franchise. Standing at 8 inches tall, this detailed action figure of the Soldier Ape character is a must-have for fans and collectors of vintage toys and comics. Produced by Mego in 1974, this figure captures the essence of the iconic Planet of the Apes series and is a nostalgic reminder of the pop culture of the 1970s.