COURSES:
New Masters Academy Drawing the Costumed Draped Figure
https://rutracker.org/forum/viewtopic.php?t=5901966
Ron Lemen Anatomy of Clothing *** This is the most helpful course I have taken on drapery***
https://online-courses.club/anatomy-of-clothing-2019-by-ron-lemen/
New Masters Academy Russian Academic Method (Drapery)
In this torrent, select level 2 sections 14-20. I recommend watching each video once and then following along with the instructor the second time. If you haven't any academic training, also do the introduction levels from this same torrent.
https://rutracker.org/forum/viewtopic.php?t=6035831
Drapery from Artwod
https://online-courses.club/artwod-drapery-course-with-antonio-stappaerts/
Functional Costume Design from Artwod
https://online-courses.club/artwod-functional-costume-design-by-antonio-stappaerts/
Creatureartteacher Drawing Costumed Figures
https://online-courses.club/drawing-and-painting-costumed-figures-by-aaron-blaise/
Will Weston Costume Drawing
https://online-courses.club/2-will-weston-costume-drawing/
BOOKS
Tons of books from Anna's Archive
https://annas-archive.org/search?q=dover+fashion
REFERENCE PACKS
Historical costume pack
https://rutracker.org/forum/viewtopic.php?t=1506103
3d.sk costume references
https://rutracker.org/forum/viewtopic.php?t=3216250
Anime costumes assets from Fire Emblem: Heroes
https://www.mediafire.com/file/msh5uv7ylm5kp2h/FE+Heroes+Asset+Collection+V2.rar
Late 19th/Early 20th century Costumes from the Hermitage
https://rutracker.org/forum/viewtopic.php?t=1092866
OLD MASTER INSPIRATION
Titian https://rutracker.org/forum/viewtopic.php?t=4169667
Michelangelo https://rutracker.org/forum/viewtopic.php?t=4341537
Rubens https://rutracker.org/forum/viewtopic.php?t=4203401
Da Vinci
https://rutracker.org/forum/viewtopic.php?t=4165087