I will make the skirts layer a bit better with shirts, but that you cannot see the hemline of the shirt when creating a dress is normal, since it's being hidden by the skirt. Unless you meant the actual waist for a skirt, which disappeared. Then I need to know what you were making and if you happen to have any screenshots, because that's definitely a bug.
As for Dimitri's name, I honestly did not know Dima was the nickname for it! However, Dimitri is already not very traditional (I'd like to have used Dmitry instead, but knowing people would constantly misspell his name, I went for a simple Dimitri), and the game is based on a fictional European country, so Russian culture would not apply, I've only borrowed the name. Plus, I've known one Dmitry and everyone called him Dmitry haha.
Funny you mentioned Alex/Alexander, because Dimitri is the only one who uses his full name, and not his nickname. There's a reason for that though.
But thank you for your input, that was very informative. I do not think I'll change it to Dima, but who knows, I may be able to write something like that in referencing the nickname.