Prompt: Generate precise technical patterns for a short-sleeved men's shirt crafted from MEDIUM BLUE AND WHITE CHECKS fabric, ensuring an equal 50/50 distribution of white and blue squares of the same size. The design should feature TWO FRONT POCKETS and exclude the Valencia collar. Provide meticulous dimensions and proportions for each component, including 2 back darts, a 3cm finished placket, and the collar button. Present the patterns on a white background, portraying a flat representation without images of actual garments or human models