Final answer:
Heidi may take off her shawl and dresses to escape the constraints they represent and to regain a sense of personal identity separate from her affluent appearance.
Step-by-step explanation:
In the context of the provided excerpts, the reason for Heidi taking off her shawl and dresses is not explicitly mentioned.
However, these passages from various texts demonstrate a common theme where characters feel constrained by their clothing, which represent societal expectations or personal wealth.
Characters often remove clothes when they wish to escape these pressures and return to a sense of authenticity or comfort. It is possible that Heidi removes her shawl and dresses for similar reasons—perhaps to feel less constrained or to reclaim a sense of personal identity that is separate from the affluence that her clothes represent.