Is it difficult and or expensive to make your own clothes?
Sewing your own clothes allows you make clothes that fit yourself to a 'T'. I sewed most all my clothes all through high school, and any major outfit all through my early 20's. I regret letting that skill, that interest, fall by the way side.
Fabric is very important to your end results, fabric really is what any outfit is all about. You can learn to look at a pattern and know what fabric will best make it work. And if in high school I could create my own patterns to overlay for my pants to fit the way I wanted, etc... any adult with an interest should be able to do the same.
When you shop for clothes you notice what is too much fabric in the thigh or butt, too short, stride not long enough, etc... Taking a basic pants pattern and your own measurements, you can cut your own basic pattern, same for form fitting shirts, etc... and overlay them on the patterns you can buy, so you can fit them for yourself.
Once upon a time, I would buy really cheap on sale fabric to experiment with till I got it right if it was somewhat complicated, you could do the same now surely. One of commenters here said sewing your own is more expensive, that shocks me, but I haven't fabric shopped in a long time. So, if fabric is now so terribly expensive, working with cheap cloth till you get it right is the best idea. Once perfected, you will have something you can make as original as an 'Oscars' outfit...........
I used to love those simple 'Make it Tonight, Wear it Tomorrow' patterns, and I would do just that, with a bottom of the barrel basic portable sewing machine from Montgomery Ward, circa 1976? . . . now that dates me.
And I actually learned to sew on a Singer pedal operated sewing machine of my Grandma's. Glad I ran across your question/topic, brings back good memories.