The publication presents step-by-step optimisation of a 3D model of the costume of Salt man 4 (the artefacts are held by The Archaeology Museum of Zanjan, Fn 987, the reconstruction was made for Deutsches Bergbau-Museum Bochum. / https://doi.org/10.1007/978-3-030-92170-5_18). The simplification (Meshlab software) employed the quadric-based edge collapse algorithm by Garland and Heckbert (1997). TPC stands for the number of triamgles per cm2. For further details see doi.org/10.1016/j.daach.2025.e00399 The authors are Victor Kuzmichev, Irina Zhukova, (Ivanovo State Polytechnic University), Aleksei Moskvin https://sketchfab.com/alekseimoskvin1 and Mariia Moskvina https://sketchfab.com/mariia89 (Saint Petersburg State University of Industrial Technologies and Design). This study was supported by the Russian Science Foundation under Project № 24-29-00268