The front bust measurement is more-or-less the half-way measurement of the full bust, stopping just half-way underneath the arm pit. This is visualised by imagining the body split in half, with a line bisecting the arm, and the measurement ending at this point.
Front Bust (measurement), Patternmaking and Tailoring Wiki
Side-front-bust (measurement), Patternmaking and Tailoring Wiki
Front Bust (measurement), Patternmaking and Tailoring Wiki
Front Bust (measurement), Patternmaking and Tailoring Wiki
Side-front-bust (measurement), Patternmaking and Tailoring Wiki
Side-front-bust (measurement), Patternmaking and Tailoring Wiki
Side-front-bust (measurement), Patternmaking and Tailoring Wiki
Side-front-bust (measurement), Patternmaking and Tailoring Wiki
Side-front-bust (measurement), Patternmaking and Tailoring Wiki
