A placket is a strip of fabric or an opening in a garment that allows it to be easily put on and taken off. It typically has buttons or fasteners to secure the opening. Full definition
Valentino cream fine silk long sleeve blouse... Pointed collar, hidden button placket front, single breast pocket with «V» logo... Long sleeves with band button cuff... Straight cut hem... (1stdibs.com)
Wool Fit & Flare Blazer: Hidden button front placket accentuates the fabulous fit of this tailored suiting blazer with classic collar and peplum waist cut on the bias for shaping. (chadwicks.com)
Crafted from ultra-lightweight viscose, the «Jackson» dress features a V - neck, short sleeves, and a full length front button placket with tonal, fabric - covered buttons. (coggles.com)