Italics for thoughts are extremely common and have been for decades. Personally, I dislike them. You are already in the character's pov. The emotions, thoughts, etc. are entirely what you are writing. You can't even promise the reader this person is reliable. So if you are already there, why set it apart? Just state it.
Italics for thoughts are extremely common and have been for decades. Personally, I dislike them. You are already in the character's pov. The emotions, thoughts, etc. are entirely what you are writing. You can't even promise the reader this person is reliable. So if you are already there, why set it apart? Just state it. Italics, to me, draw a reader out of the character. It makes the reader aware that, yes, somewhere a writer has written this down. You aren't really in the head of the character. This character isn't really telling their own story, third person it may be--it should still come across as enveloped in the character's world.