*correction*

So I've been telling everyone, including my readers, that the bridesmaid dress I like is tissue taffeta.  I finally double checked the dress description today and realized it's IRIDESCENT taffeta. 

Does this matter?  What are the pros and cons of iridescent taffeta?  What are the pros and cons of taffeta in general? 

I'm a pretty good planner but lately, these wedding decisions are stressing me out!