You'd be surprised at how dirty (in some cases, filthy) some tutus are, yes, even in professional companies. They get sweated in during each performance and get cleaned maybe once a season -- if at all. Sometimes the perspiration is so imbued in the material that it leaves a permanent stain. And then there's the altering -- the repositioning of hooks and eyes, the tightening strings and elastic shoulder straps; retacking the underpinning threads that connect the layers; the taking in under the arms or in the bodice, or the letting out of darts and folds -- to accommodate different dancers over the life of the costume. Some companies don't have a dedicated costume mistress or master, so there is not that fussy tutu person breathing down each dancer's neck, watching their every move in the tutu.
Years ago, I had the privilege of steaming the wrinkles out of Anna Antonicheva's Act I Giselle romantic dress (the usual white with blue sash that most Giselles wear). After my utter amazement at the teensy-tiny size of the waist and bodice, I proceeded to try to put some life into the garment. The white part was gray with wear, the bottom edge of the dress frayed, the blue at the bodice more dusty than you could imagine. And was it ever wrinkled, having traveled from Moscow. That's why I was given the job of trying to revive it for its stage debut in Toronto. I worked and worked on it, did the best I could, but a lot of wrinkling still remained. I steamed that tutu almost up to curtain.
In performance, MAGIC!....the drab romantic tutu I was worried about looked stunning! Fresh and lovely, with no gray overtones at all, it was absolutely beautiful.....and
I was absolutely dumbfounded. Of course, Antonicheva's dancing made the tutu look lovely, but I also think that stage lighting doesn't get enough props.