It's exactly what they've done. Not on some
shyt, but, to your point, Bella's jeans are way baggier than what they were in both games. And her shirts are oversized. Storm Reid was towering over her like Bane was towering over Dagget in The Dark Knight Rises.
That wasn't the case in the game; they were way closer in size and frame.
To your point with the hair: it's pulled back and tied up like you said. But even in
Last of Us 1, it wasn't like that. She had really prominent bangs shaded to one side.
For me, that is actually the biggest departure for Ellie in the show, physically speaking. There was something off with Bella's Ellie, aside from the looks, and I couldn't figure out what it was till I went back and played
Left Behind a few weeks ago. It's the hair. I feel like they should've adhered to the game's hairstyle. But you can't deny that she looks younger. Truth be told, I ain't like what they did with Tess' hair either.