According to Yana’s tweet, it was Lizzy who picked Edward’s outfit in the BotA movie!
“[…] The reason why Edward’s clothes are so cute even though he doesn’t like *fashion is that he loves his sister so much and whenever Lizzy says “I think this will look good on you, brother!” he just amenably wears anything [she recommends]. -Toboso”
*Note: ”nanpa” is a different word to translate, it actually means “anything that is ‘shallow’ and ‘not manly’“, especially fashion, flirting with girls, etc.
His clothes are rather cute because of Lizzy’s taste in fashion.
Edward himself
is
indifferent to what he wears, that’s why Lizzy