This paper examines the possibility of creating harmony between the weave and colours of the fabric on the computer using the interactive evolutionary algorithm. The starting assumption is that it is possible through the use of the evolutionary algorithm to improve and partially automatize the creative procedure of the creation of fabric pattern (harmony between the weave and colours of the fabric). In the contrast to the possible approach to solving this task, through the application of the knowledge of human experts (expert system) the system described here solves the problem with the minimal use of rules and knowledge base and so it expands the area of fabric pattern searching. With the practical realization of the system the goal was, with the help of examinees, to evaluate the aesthetic appeal of the patterns and so making it possible for the persons who are not experts in the area of textile technology to use the system. The examinees evaluate the patterns (harmony between the weave and colours of the fabric), which are created in the computer and shown on the screen, using grades. Pattern grades provided by the users are subjective assessments; therefore an interactive evolutionary algorithm was selected to harmonize the weave and the colour of the fabric. Based on the pattern grades, which at the same time represent the fitness, a procedure of selection of the individuals which are used to create new individuals through recombination is conducted. It is assumed that the average value of the fitness and the best fitness of the patterns created through the algorithm will increase from generation to generation of the interactive evolutionary algorithm. Using the MATLAB program tool a computer program for creating the harmony of weave and the colour of the fabric has been created. The paper shows the structure and the parameters of the algorithm for harmonizing between the weave and the colours of the fabric. Explanations have been given concerning the way of displaying the population, individual, weave, weave unit, the sequence of warp and weft colours in the algorithm, the selection procedure of the algorithm, manner of changing the sequence of warp and weft colours and the manner of changing the weave unit. The parameters of the interactive evolutionary algorithm have been adjusted according to experience and answers acquired by the examinees. The manner of the testing of the algorithm and the analysis of the results provided by the examinees based on the use of the program are shown. Based on the examination, result analysis and answers, new versions of the program have been created to harmonize between the weave and colours of the fabric based on the interactive evolutionary algorithm. These were tested and intercompared in order to establish the possibility of the use of interactive evolutionary algorithm to harmonize between the weave and colours of the fabric. The research has shown the appropriateness of the use of the interactive evolutionary algorithm; therefore next step was establishing the most appropriate version of the algorithm. Six versions of the algorithm have been tested, with results analyzed and shown. Their intercomparison and the comparison with the test pattern generator (randomly generated patterns) have been conducted. Based on the research and result analysis it may be concluded that the starting assumption on the successful applicability of the interactive evolutionary algorithm for creating the harmony between the weave and colours of the fabric has been confirmed. At the end of the paper there is an elaboration on the possibility of further advancements, improvements and developments of described algorithms. In the basic form certain possibilities for improving the algorithms described in the conclusion have been tested. Results of these tests have been shown and analyzed.