Leaving the edges of a garment unfinished used to mean one of two things. Either you were an eager beginner, or you were an artsy-hippy type and it was part of the vibe.
How to Sew Clothes — An All Well Guide — all well
Glossary of sewing terms - Wikipedia
6 ways to finish the edge of your hem
Cut and Sew: Benefits, Process, Types, and Machinery
How to Make and Sew Bias Tape - Melly Sews
Using a Fabric's Raw Edges as a Garment Design Detail - Threads
Gertie's New Blog for Better Sewing: Finishing Seams on Lined Garments: What's Your Take?
How To Applique Fabric For Clothing Or Decor
Using a Fabric's Raw Edges as a Garment Design Detail - Threads
Sewing Glossary: How To Hem A Curved Edge – the thread
How to Fray Fabric Edges