Sewing Method, should I match the thread/fabric on the inside of the garment.
Either way is fine, your choice as the sewist.
Probably the best advice to have on hand some threads that blend with the most fabric, grays, pinks, off-whites, medium browns, and medium blues.
Less chance to have to change bobbins or rethread machine, more important if you are using a serger, not many people like to rethread a serger.
Most practical, some say it doesn’t matter its on the inside, I use what in the machine, or what I have a lot of spools. of.
Least practical (I fall into this pool of people), I try to match the color as best as possible.
I sew mostly for myself, and then as gifts for people, then makes for friends, then special orders for friends, friends of friends, occasionally people I meet in person (mostly fetish wear). Don’t make for public or public sales, not looking for a job. I like to sew as an artform or hobby.
Not in competition with anyone, for getting something done or who made it better. My competition is myself, therefore, I am the judge, inspector, critic, and reviewer, of my makes. Harder on myself then I need to be, but its part of my core personality will never change.