I'm learning German all by myself for three months with Babbel and all I can find in the internet and on that point I feel lost.
I looked on the questions already asked here, and I think maybe this one "answers" (but not really) my question.
In a lesson of Babbel, I can find :
Welcher Mantel sieht besser aus?
Welchen Rock trägst du zur Party?
As presented in Babbel it looks to be obvious and there is no more explenation. In both cases I would have chose welchen because for me in both questions we are speaking of “what”, … of coat, of a skirt.
And so, I don't even understand the existence of Welcher in nominative case.
Can you enlighten me please? Is there a question I can ask me in this particular case, to know if I must use the nominative or the accusative?