MS. SOFTEE: The seductive scales of the ice-cream truck jingle are part of every New Yorker’s summer soundtrack — but this fall, that sound will be coming to the tents. Designer Michelle Williams (no relation to the actress), who is a year-round ice cream consumer, hit upon the idea of showing her Quail label’s spring looks alongside some frosty treats. She’s arranged with Brooklyn’s Van Leeuwen Artisan ice cream to have a truck make stops outside Bryant Park and Milk Studios on Sept. 11 from 2 to 4 p.m. Models in Williams’ Fifties pinup-inspired looks (sweetheart dresses, bustiers and motorcycle jackets) will be taking orders for cups and cones. As a smaller label that is not doing a show or presentation, Williams explained, the truck is “a great way for us to be where the action is.” (In other words, lure them with ice cream.) And she added, “I guess I am hoping for hot weather. That would be ideal.”