In my previous post, I asked in the comments section whether in the sentence
Ich glaube, Julia gefallen einfarbige T-Shirts
the verb gefallen should actually be gefällt since I thought the subject was actually Julia since she was liking the T-shirts.
One user agreed, but another user said:
No, in "Julia gefällt das T-Shirt." or in "Julia gefallen einfarbige T-Shirts." the subject is T-Shirt and T-Shirts, not Julia. The plural is not the problem, it's the "someone likes something" vs. "something appeals to someone". The grammatical subject-object are swapped here.
I'm slightly confused. What is right and why?