What is Reddit's opinion of The Costume Technician's Handbook 3/e?

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There is also the option of hand sewing which takes longer but when mistakes come up especially in learning how to sew say a hem, you have the benefit of easily undoing your last stitch versus pulling every thread out in the libe and doing it again. There's also the bonus of rhe look of aunthenticity of a hand-sewn stitch versus a sewing machine.

See if your local library has this book to checkout (or other books even like it).

https://www.amazon.com/Costume-Technicians-Handbook-3/dp/0325004773

Its pages on hand sewing are especially helpful along with other costuming tid bits (We used this in our costume construction courses for Theatre Arts in college). If you go the route of hand-sewing, practice-practice-practice the Back Stitch. Its the strongest stitch that existed prior to what machines can do and used for a very very long time pre-machines.

I also suggest this book, https://www.amazon.ca/dp/0325004773/ref=cm_sw_r_cp_api_f181Bb4P31STW. I used it all through college and now. Its pretty straight forward to making simple body blocks and other cool stuff. The only thing is that you'll need a master list of your measurements to refer to. There is math involved.