Dress code in Rajasthan

I've read through a few posts in relation to temperatures etc in Rajasthan and have now decided that I will not give away my cold weather gear and sleeping bag that I was intending to discard after Nepal and Dharamsala.
We will be travelling in Rajasthan this December so I'm expecting the evenings to be pretty chilly.

Aside from this I hadn't intended to bring any "fancy" clothes with me as I want to pack very light (travelling for 5 months). However, I'd like to have the odd treat along the way like dinner at the lake palace in Udaipur. The LP says to dress smart but what does that mean? I was going to take a below the knee linen skirt but didn't know if culturally that would be offensive? (I'm a girl obviously!) And will they allow me in to places like this wearing my Teva / Merrell's ?

I'll probably get a Salwar Kameez made up in Delhi so as an alternative would this be dressy enough?

Can anyone help?

It can get chilly during the nights but nothing a jumper, blanket and hat wont keep out
It's also nice and hot suring the day
perfect weather really

Dress as you would anywhere else in India

Salwaar Kameez is always a good option.

If you dont have time in Delhi to get something stitched up Udaipur itself has several good shops that seem to sew up salwars, western outfits right there so you dont have to carry a ton of nice things with you if you want something tailor made.

There is a fab silk fabric shop near Jagat Niwas/Lal Ghat area where they have yards of raw silk that can be custom stitched in a couple of days. There was a nice boutique by Ganguar Ghat as well near the german bakery/The Bag Shop (another cute store in itself) So you are ok if you dont have anything till you get into town as I am sure you can find things to buy or stitch up upon arrival.

We are in Rajasthan every November/December and often you don't even need a sweater at night, especially when it's been dry for so many years--it seems to get warmer every year. Surely take a sweater, and you'll want to buy a shawl of some sort anyway.
How true what trvl_in said "every square centimetre of your fabric and skin would be subject to laser beam scrutiny" But it also includes tourists, you'll just be found lacking by Indian standards almost no matter what you do! Linen skirt would be absolutely fine for dinner at the Lake Palace--fancy salwar kameez would be much more fun!!

A salwar kameez can be pretty dressy, especially when embroidered or made of a soft, light fabric, like georgette. Forget the skirt unless it comes all the way down to your ankles.