Phantom From Space

From Wikipedia:

Phantom from Space is a United States science fiction film produced in 1953. The film was produced and directed by W. Lee Wilder from an original screenplay written by William Raynor and Myles Wilder. It was one of several films made in the early 1950s by the Wilder brothers, Raynor, and most of the same crew, independently on a financing-for-distribution basis with United Artists and, occasionally, RKO-Radio Pictures.

The story concerns the sighting of a UFO which appears to have crashed in the San Fernando Valley, after which massive interference with teleradio transmission brings FCC investigators to action. They, in turn, begin encountering reports from people of seeing what appears to be a man dressed in a bizarre outfit. Their investigation uncovers this is a being from outer space who, to escape capture, removes his spacesuit and proves to be invisible. The invisible being running loose sets off a massive manhunt and public panic.