Will my housekeeper get offended if i supply her with a uniform?

I have just hired a full time, live in housekeeper, and she currently wears her personal clothes to work. I want to offer her a uniform to wear so for 2 reasons: 1stly, so that she doesn't have to get her own clothes dirty while working around the house; and 2ndly because it looks more professional. I don't know if she will feel like I am undermining her or putting her down by making her wear a uniform. What does anyone out there think, is it a big deal?