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This was shared earlier here but the link is dead. Doing it on request:

デジタルツールで描く! 服のシワと影の描き方- Draw with digital tools! How to draw wrinkles and shadows on clothes. With extra files.

https://www.amazon.co.jp/%E3%80%90Amazon-co-jp%E9%99%90%E5%AE%9A%E3%80%91%E3%83%87%E3%82%B8%E3%82%BF%E3%83%AB%E3%83%84%E3%83%BC%E3%83%AB%E3%81%A7%E6%8F%8F%E3%81%8F-%E6%9C%8D%E3%81%AE%E3%82%B7%E3%83%AF%E3%81%A8%E5%BD%B1%E3%81%AE%E6%8F%8F%E3%81%8D%E6%96%B9-%E7%89%B9%E5%85%B8-%E6%9C%AC%E6%9B%B8%E6%9C%AA%E5%8F%8E%E9%8C%B2%E3%81%AE%E3%82%A4%E3%83%A9%E3%82%B9%E3%83%88%E4%BD%9C%E5%93%81%E3%83%BB%E8%A7%A3%E8%AA%AC%E3%81%AE%E7%89%B9%E5%88%A5%E7%B7%A8%E9%9B%86%E7%89%88-%E3%83%80%E3%83%86%E3%83%8A%E3%82%AA%E3%83%88/dp/4839967156/ref=pd_bxgy_14_img_2?_encoding=UTF8&pd_rd_i=4839967156&pd_rd_r=bda55a67-c97f-11e8-a190-476d9b323ffb&pd_rd_w=I2G9v&pd_rd_wg=fPBce&pf_rd_i=desktop-dp-sims&pf_rd_m=AN1VRQENFRJN5&pf_rd_p=a4de75e6-d8f7-4a34-bd69-503ea4866e6c&pf_rd_r=4GEK5HGW70RPR1BSPNVQ&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&psc=1&refRID=4GEK5HGW70RPR1BSPNVQ

DL:
https://www.mediafire.com/file/qjues410d1u6ndf/%25E3%2580%2590Amazon.co.jp%25E9%2599%2590%25E5%25AE%259A%25E3%2580%2591%25E3%2583%2587%25E3%2582%25B8%25E3%2582%25BF%25E3%2583%25AB%25E3%2583%2584%25E3%2583%25BC%25E3%2583%25AB%25E3%2581%25A7%25E6%258F%258F%25E3%2581%258F%2521_%25E6%259C%258D%25E3%2581%25AE%25E3%2582%25B7%25E3%2583%25AF%25E3%2581%25A8%25E5%25BD%25B1%25E3%2581%25AE%25E6%258F%258F%25E3%2581%258D%25E6%2596%25B9.rar/file

Thank you to the original uploader.