I guess it depends a little bit on what sort of look you are trying to achieve. Luxurious? Hip? Cozy? Modern? Fabric will hold onto odors, so would that be the best choice for a salon or would you be better off with shutters or blinds that can be washed?
Normally I would suggest you line the panels so they are ivory from the street. However, in this instance you may want to consider pattern on both sides to attract passers by. My first thought would be a sort of traditional pattern in neutral with a ball or tassel fringe on the leading edge. http://www.calicocorners.com/p...mask/pliana+sisal.do Tie them back so they have a graceful fall to them. If you want a more modern look, skip the fringe but band them in a contrasting solid. If the window gets a lot of sun, consider outdoor fabric.
If you decide to use the window for displaying merchandise, you should probably use a solid fabric on the outer side so the products take center stage. I would still trim the leading edge with something (fringe or banding) so they have contrast.
Not sure of the decorating style you want for your salon but have you considered the solar shades? They have some nice textures now instead of plain vinyl. There are different weaves to the shades for how much light comes through them. You can order sample swatches too.
Glad to see you have finished reno's, moved in, and are in business! Congratulations!
I would do very full sheers for partial privacy. If you want a more girly look you could even use lace. If I were that customer near the window I'd feel very exposed with no privacy from anyone walking by on the sidewalk. If you want a more decorative treatment use tied back panels at the ends as well. These could be the same sheer fabric or plain or printed fabric and ideally lined as they hang and look better. I would prewash all fabrics so everything is washable. Nothing worse in a business than seeing less than pristine curtains.
Alternatively you could hang cafe curtains either to windowsill length or floor length. The top of the window would than be left uncovered. I would have the level where even a tall person could not look in. Sheers or lace do not completely block views but do give a feeling of more privacy.
Shutters over the lower part of the window would also work. Depends on the decorating style you want.
"I have always had an aversion to the concepts of in style and out of style." ~Rose Tarlow
This is a business, so it's all about image. What image do you want to project to people walking by on the street? Who is your customer base? What demographic are you targeting? If you're giving poodle perms to purple hairs, granny curtains are good - velvet, tassels and tie backs. But if you want to promote a younger, hipper, and hopefully returning, client, what about a faux-bamboo roller shade? Doesn't absorb odors, it can be rolled down if you have a prob with afternoon sun/heat; and low maintenance. Or what about just a cool valance? And consider coordinating your inside decor with your blinds, or vice-versa. The main thing here is to think about your market and focus your decor and color choices on the clientele you're hoping to attract. Or you could do a cool valance with a roll-down shade of some type; it would be hidden behind the valance when you didn't need it, but could be let down if necessary. Or, for a few more bucks, you could get a custom roller blind with your logo on the outside so it faces the street.