In a recent discussion on another forum someone pointed to Niven's 1967 "Flatlander" as depicting a space suit that was a single skin-tight garment (except for a neck seal and a helmet) optionally covered with a separate protective/insulating layer (as required).
I'm not sure I recall it being depicted that way (I don't recall an oversuit being described), but I know that Pournelle used that exact pattern for his Mars suits in Birth of Fire (1976).
What was the first work that described a skintight garment to retain pressure by mechanical pressure against the skin (instead of a layer of pressurized atmosphere), with additional (more easily changed) over-layers for insulation/armour/etc.?
Based on requests for clarification, I'm looking for a space suit; an air-tight pressure suit for use in vacuum or extremely low pressure environments. It should completely cover the body, leaving no exposed skin, except for the head which should be enclosed in a helmet. This likely requires fiction that recognizes space as being a vacuum, or another planet or body having extremely low atmospheric pressure (less than a survivable level, so at most 0.06 bar).
I'm willing to accept a speculative article or essay (similar to a Popular Science-style future-tech "this is how the future might be" article) that examines the idea in a factual way as well as the use of the idea in fiction.
I'm not interested in a pulp cover depiction of a form-fitting space suit done purely for aesthetic reasons; this needs to be an intended design, with the skin suit explicitly maintaining the body's internal pressure. A clue would be the wearing of additional outer layers to protect against radiation, micrometeors, extreme temperature, chemicals/dust, etc.