This is a bright red Isolation suit with helmet worn by "Lt. Commander Data" during the thrilling opening action sequence of Star Trek: Insurrection (1998). It's a complete collection of both "hero" and "stunt double" pieces worn by actor Brent Spiner and his stunt double Brian Avery.
The isolation suit was a type of stealth clothing used by the Federation Starfleet in the 24th century. The suit was equipped with technology that made the person wearing it practically invisible.
This Isolation suit includes Spiner's hero helmet and boots. The helmet has internal padding and an accordion collar. Brent Spiner's gold make-up is still visible inside. The boots are made of rubber. The belt has stunt double Brian Avery's name in it.
A gray shoulder piece from the Starfleet uniform as well as the yellow tunic is under the Isolation suit. The tunic has the screen matched burnt collar. Remember the scene when Data removes the helmet and is his head "floating" in the air. You can see the the damaged collar after Data was hit by a Son'a disrupter.