Oh, the male gaze ...
An unchivalrous reviewer on these pages describes Theresa Russell as “looking a bit chunky these days, I'm afraid to report”, while another refers to “her willingness to appear overweight in a bikini”.
At the time of the film's release, she was 35 years old and her role in it is an unemployed and childless married woman. To my eye, she fitted the part and if one needs a physical description I would merely say she looked nicely ripe.