I'm quite surprised that Petticoat isn't showing up on the paler girls here- I own it from the first release, and while mine has massive veining (which I actually try to avoid!!) Petticoat DEFINATELY shows up well on me. I'm NW15 for reference. In fact, I've been neglecting my mineralized blushes (Dainty, Love Thing, Merrily and Gentle!) in favour of petticoat these past few weeks!
I actually find it to be gorgeous- especially when I have a few imperfections to cover on the cheeks. I've found that if I apply blush in those areas, sometimes it tends to make it more obvious, even though I've concealed it and everything
Petticoat adds are really nice 'softening' kind of effect to areas like that so that it is much less obvious (on me anyway!) Perhaps it depends on how you apply it? I apply mine with the 188 and buff it in heapss. It shows up really dark on me if I use other brushes! Otherwise, it shows up on me as a kind of transclucent pink glow!! Makes my skin looks heaapps healthier than it is lol!
The only other MSF which seems to do this on me, would be Light Flush (which is why I usually use that on top of blushes...)
I wonder why Petticoat is so different on me, though we are both so pale!! It is definately one of my most pigmented MSFs after Metal Rock!! Even Stereo Rose comes in after Petticoat for me!!
I've applied petticoat on my darker friends, and it looks even better on them than it does on me!! I put it on my friend once and went out to dinner- spent all night staring at her cheeks thinking DAMN that looks nice on her... I wish it did that for me =\ I would estimate that she's about an NC25. Have another friend who loves it (gave it to her as a birthday present about a year ago) and she's heappss darker (darker than Medium Dark MSFN) and it works perfectly on her too