This tutorial shows three ways to hem knits. Note the interesting, accordion pleat method, which duplicates is a nicely professional look.
The Refashion Handbook: Refit, Redesign, Remake for Every Body
2 Ways To Refashion Old Sweaters Into Beautiful Fashionable Cardigans
Upcycle a thrift store sweater with this photo tutorial by the Renegade Seamstress
How to Put a Zipper in a Sweatshirt: My Newest One Minute Video
The Renegade Seamstress shows you how to make an old t shirt new again with this easy sleeve refashion tutorial. I'll be altering this design for a costume idea.