Some things to consider when substituting a yarn.
Working a pattern in a different yarn than the garment is pictured in can provide a whole different look to the garment. I decided that in order to choose a yarn for a second bolero, I would need to swatch not only for gauge, but to see how the panel pattern would translate in another yarn.
I swatched a few of my other favorite CE yarns to decide which I would use to knit the second, more casual version of my Bolero. I have narrowed it down to two yarnsboth with which I can get the same gauge as Intrigue, but each provide very different finished looks.