Long sleaved shirt "Hinagiku"
"Hinagiku" (Japanese ヒ ナ ギ ク "daisy") is a shirt for elastic fabrics with long sleaves, which can also be shortened as desired, a basic particle to pull underneath and combine. Hinagiku can be sewn with either a round neck or turtleneck, with or without bust darts. For the turtleneck version, I recommend very stretchy fabrics with elastane content, because the neckline is very narrow.
You can find instructions on how to sew them together in my Blog.