I wasn't sure what Rolando's technique was, so I had to go and check it out on the tips page.
I was shown this technique for creating a soft focus filter many years ago, but with a different source for the filter material.
Talk nicely to one of your models and see if she has any old snagged black nylon stockings she can give you. I know Rolando claims to only pay 1.99 for his scarf, but this is guerrilla photography JimmyD style! [img]/ubbthreads/images/graemlins/grin.gif[/img] Of course, if you have to go and buy a pair it still shouldn't break the bank.
You simply cut a small sqaure of material from the nylon (about 3"x3") and attach it to the front of the lens with a rubber band. You then gently stretch the material taut under the band. See illustration below (you can trim off surplus material with scissors if you prefer).
The advantage with this material is that it will stretch, and the more you stretch it the more sheer it becomes. So now you have a variable soft focus filter, that takes up no room at all in your camera bag.
Anyway, in my opinion, there are better places to hang a scarf.
Personally I tend to agree with some of the other replies and I prefer to keep maximum sharpness and detail for as long as I can. In the past I might have used the filter if I was shooting transparencies, because you could not soften the image later. However, if I was shooting for later printing then I would save the filter for use on the enlarger lens.
I think I would adopt the same philosophy for digital. It is easier to soften the detail in a sharp image than it is to try and recover detail from a soft image.
Hope this is useful to you.