Flareup (1969)

"Flareup" is a late-60s exploitation thriller centered on go-go dancers stalked by an obsessed killer. Raquel Welch stars in a nightclub setting where the menace is real and the dancing is just cover for it. The site holds 1 scene clip from the film, showing Welch topless in a sequence built around exactly that. It dates from early in her career, before she became a fixture of the genre.