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If you want to participate in an interview a nanny, then I think I can recommend that you wear nice clothes make the man feel that you are a dignified and elegant woman and child so I would like you to believe that you can succeed in the interview you can consider a look such styles of clothes
<a href="http://www.earth-camel.com/product/Women-BCBG-Max-Azria-Dresses/BCBG-Max-Azria-Dresses-30-64861.html?af=15" rel="nofollow">http://www.earth-camel.com/product/Women...</a>
I'd wear a casual dress that goes at least to the knees and no cleavage showing. Maybe a cardigan depending if it's thin straps. Or you could wear jeans or capris with a T shirt or a more professional shirt if you want a responsible look. Hope this helps
Just dress modest and casual. I would wear jeans or long shorts with a high necked t-shirt and sandals
Pair your dress with a cute cardigan! It shows the parents you're conservative, which makes you seem friendly, and responsible.
Best of luck!
Wear something you can move in. No short skirts or cleavage revealing tops. Flat shoes. Minimal jewelry. Avoid perfume until you are certain nobody's allergic. Clean jeans and a nice tee should be good.
You should go for a modest and innocent look. No one wants a rebellious looking girl babysitting their children. Keep your makeup natural. And the dress sounds good.