Ok...
I got the main reason right here for these changes...
Tomb Raider visionary Toby Gard—the animator who created Lara Croft and came up with the initial concept for the game—was unhappy.
"The idea was to create a female character who was a heroine, you know, cool, collected, in control, that sort of thing," he told Gamasutra in 1998.
But Eidos emphasized Lara's sex appeal in marketing, putting her in provocative poses and revealing outfits on posters and advertisements.
She went beyond a simple comic-book-style caricature of an attractive woman to appear something more carnal and sleazy.
Toby Gard wanted Lara Croft to be sophisticated and unattainable, but Eidos marketing often portrayed her solely as a sex symbol.
Marketing in those days was loud, laddish, and barely in touch with the video games it was tasked with selling. It was also detached from the processes within Core.
"Marketing was seen as this invisible bunch of imbeciles that always kept asking these idiotic requests that we couldn't fulfill," recalls Sandham.
"I don't think we ever met anybody from marketing. Marketing was this invisible thing that would just be there to irritate us when we were in the middle of a crunch."
Gard had his own visions for how Tomb Raider would be marketed. His idea for Lara, which he wanted to get across in movie-style posters and slick marketing material, was more sophisticated.
"He presented these ideas to Eidos, and the Eidos marketing guys basically went, 'What? Go away, little man,'" says Rummery.
"'We're not interested. What are you doing here? This is our job.' And he was so pissed off about that. He couldn't let that go."
Oh, and the first "size changes" happened in the first reboot: Tomb Raider Legend(2006)
Sorry for the long post
Thanks and regards
spidey360