If you go the classes route to learn about making your own custom garments (which you totally should if you really want to do more as a cosplayer), I recommend taking sewing classes first, and then get into patternmaking. If you go into pattern drafting with that foundation of sewing knowledge, you'll have a better understanding of what you need to do to really complete a workable pattern.
While you could do patternmaking first before sewing classes, the people I've seen go that route tend to struggle a lot more, make more mistakes, and don't really have as much grasp of the finishing additions needed for when the garment will actually be sewn.
FF9 cosplay? Hit me up!
2014: Anime Los Angeles, Anime Conji, and whatever else falls into my lap
I now have a Tumblr
. Sometimes I use it.