Buy a few things, and see how they work out. Sometimes you don't discover the details of fit and comfort until you wear a garment a few times. Also, you can buy a few things at full price and then wait for a sale to stock up.
Re shoes: lace-ups are more versatile for work than loafers. A nail salon is obviously a fashion business and so not about conservative business dress, but you never know what you'll be doing next.