This study aimed to investigate casual jackets" production status and construction characteristics for men in their 20s and 30s, the so-called MZ generation, and suggest a representative casual jacket prototype. The production status of men"s casual jackets was searched online, and menswear pattern textbooks were examined. The results of the study are as follows. As a result of analyzing size, some brands displayed letters and numbers together. As for the sizing system, the size was expanded from two to five depending on the brand, and the number of brands developed into four was the most, with nine brands. The size deviation of the chest circumference varied from 3cm to 6cm, and most brands developed at regular intervals of 5cm. Black was the most common color in the first and second rounds. There were ten types of materials; poly blend showed the highest frequency, and cotton showed a relatively high frequency. As for the price, more than one hundred thousand won and less than 400,000. In terms of clothing construction components, the silhouettes were divided into two types: boxy fit and slim fit. For boxy fit, notch lapel, flap pocket, two-button single closure, chest welt pocket, dartless front bodice, and center vent showed the highest observation frequency. For slim fit, notch lapel, patch pocket on both sides, two-button single closure, welt chest pocket, front dart, and side vent were high frequency. As a result of analyzing the jacket components in the textbook, both the silhouettes and the lapel shape came out as slim fit and notched lapel, and the pocket showed the highest frequency of patch flaps. Three-button single closure showed a high frequency. Finally, this study suggests two representative casual jacket prototypes based on the jacket"s silhouettes.