Vulcan desert soft suit
From Memory Alpha, the free Star Trek reference.
A Vulcan desert soft suit was a type of clothing used by Vulcans to survive the harsh desert conditions of Vulcan's Forge.
Spock and his younger self wore desert soft suits while they were in The Forge. The older Spock's suit was provided by the Enterprise's wardrobe section. (TAS: "Yesteryear")
