It is perfectly acceptable to set professional expectations for your nanny's attire, especially to ensure they are comfortable and safe while interacting with your child. Many parents find success by framing the dress code around practicality, such as requiring loose-fitting, comfortable clothing that makes it easier to move, crawl, and play on the floor with the baby. You can provide a set of 'work clothes'—like cotton kurtas or T-shirts—to be worn during duty hours, which also helps maintain hygiene and simplifies your daily routine.