>>56835279Someone here said last week Mega-Lopunny is based on aerobics / female workouts.
You can make a lot of explanations for why the tights are "ripped", but in keeping with thematics the most appropriate explanation is it being indicative of hyper-exertion and over-activity.
When you go hard, your clothes rip. With all mega-evolutions, there are design elements hearkening to its nature of being a burst limit, with the power "bursting at the seams" and making elements of the form look broken and distorted.
With Lopunny-Mega, that design element is the "tears" in its "tights".