I have noticed mine are more front and center after years of wearing bras."It seems reasonable that the breasts are as malleable as the rest of the body, perhaps even more. With enough time, even slight pressure can cause the body to adopt a new shape. There are braces to move teeth and bones around, reshaping contacts to correct one's vision, and even neck elongation as practiced by some African cultures. I often see the marks left by tight wristwatch bands, CPAP face masks, eyeglass bows, and even my own socks. It happens."
Medically this is not entirely true.
Marks left by socks etc are likely pitting edema and shorter lived. Orthodontic movement etc are osteoclastic remodeling which dose not occurs in soft tissue.