Reddit reviews Fitting and Pattern Alteration: Bundle Book + Studio Access Card

Pattern drafting and clothing sketches are two entirely different things. I didn’t get much out of school in terms of sketching but some books that helped me were Illustration Techniques - Takamura Fashion Illustrator - Morris and this one which was a textbook of ours Fashion Drawing - Bryant. When it comes to flat pattern making, “art” and “drawing” have little to do with it, it’s measurements, rulers, curves, tracing paper (medical doctors office paper is my favourite), cardstock “oaktag” paper, mechanical pencils and the foggy kind of cello tape you can draw on. Basically you learn to make a bland sheath to fit the body first (“block”) then you can learn to manipulate the block into different pieces and designs and there you go, you’re drafting. It’s the whole reason I’m in school right now and if they had it on YouTube I would never have bothered enrolling.
The best books for that are first and foremost Patternmaking for Fashion Design - Joseph-Armstrong, Patterncutting/Patternmaking - Chunman-Lo and I’m looking forward to getting The Costume Technician's Handbook (3rd Edition) - Ingham/Covey which a classmate said is great for blockmaking, and Metric Pattern Cutting for Women's Wear - Aldrich which I’ve been told is a staple.
As far as editions, the later ones of Patternmaking for Fashion Design are better for basic block making and they have way more than the earlier ones, and the girl who put me on to the Technician’s book said the 3rd is essential. The rest I wouldn’t really know because I haven’t used them extensively. Afaik Chunman-Lo’s book has only one edition.
There’s also Fitting and Pattern Alteration- Liechty/Rasbrand/Pottberg-Steineckert. We haven’t used it yet but it’s on the curriculum.
With these resources either bought or borrowed from the library you’ll learn everything a fashion student learns. As far as sketching goes, YouTubers are out there and can help, and practice makes perfect.
I hope this helps. Post progress photos so we can see how well you’re doing! Good luck.

For alternations and minor design changes I like this: Fitting & Pattern Alteration. It's a textbook so it's pricey but the older editions are just a good and cheaper. I learned the seam method from Lorraine Henry's seminars at expo's. I think you find some on youtube to get a good idea of the process.