Clothing style designing and mass production tasks and regularities have been researched using average complexity women coat designing tasks or the time sequence of events as the basis, by means of the PERT (Program Evaluation and Review Technique). On the PERT graph of the women’s coat designing and production, three homogenous stages can be distinguished: I, II, III. The task execution process from the first event to a finished prototype of style (stage I), in the case of classical designing work organization, happens almost sequentially, adding about 45 working hours. Stage III – at the final stage after the preparation of the markers to handing over the finished order to the consumer a sequential task chain is accomplished, too. At stage III, the total time of women’s coat assortment event process will take up to 15 hours for one unit if a series of tests is produced in advance, and only 2.5 hours if a series of tests is not produced. At the stage II of the graph, three situations characteristic of apparel producers have been analyzed: reception of raw materials and control within two weeks during the model production season; the distribution of model project carried out during its production season; model project distribution, which is not necessary any more (the designing of collections has begun one season before the mass production of the model), and the reception of raw materials. The average expectable duration of stage II, based on the hypothesis on the working time distribution law, is 59.74 hours. Useful free time reserves have been found in the designing process of women’s coat of medium complexity and mass production processes.