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Here are some pictures from my own archives that show Obi-Wan's tunics pretty clearly. They should help show that the tunic design has not changed, and in fact they may be the very same tunics Ewan wore in Episode 1.
The thing about Ewan's tunics is, depending on the lighting, they can appear to be a dark sand like Qui-Gon's, or a very light ivory. In reality, I believe they're an eggshell or taupe color. Here's Obi with Qui, compare the shades:

The problem with finding fabric is, we just discovered that the Jedi outfits and even Sith were made from Indian homespun. I have never heard of this fabric. It's not wool gauze as some have insinuated, which I found out when I was given a swatch of wool gauze and found it to not have the texture of Obi's tunics. But now, we're in a race to find dealers who offer this fabric, and at a reasonable price. As of right now, I have no idea where to get Indian homespun and whether I can afford it. For all we know, it will be $30 a yard. Now, I'm left questioning whether Liam's costume was also homespun, or indeed raw silk as some have insisted. So, in the meantime, I skimp by using linen or linen blends, which have the same texture and weight, and from a distance appear to be the same. Linen is also a flax-based material like homespun, and is widely available for very low prices. But linen doesn't come in the exact shades. For Qui tunics, I use a darker sand colored linen, or camel. The first set of Obi tunics I did was bleached white, but I'm definitely going darker from now on, with a natural shade.
More pics of Obi-tunics:

That last pic is a great comparison shot - you can see the creamy color of Obi's tunics (as well as the design) next to Qui-Gon's sand-colored tunics. Based on these images, I'm positive the undertunic is lighter in color anyway, but if you want a pure white undertunic, that can be done too. This is the other shot I have of E2 Obi, the infamous undertunic shot:

That pic helped me tremendously. No one could figure out how to make the sleeves do that bunching thing at the wrists, or how the collar was shaped. Thanks to a careless Ewan and a sharp photographer, I have a design that's exact to those specs. And it works marvelously, if I do say so myself...