Cbelle, are you talking about the blue and white bra top in Power Hour? I don't see Cathe wearing the same top twice in PH and the S&H series.
If you're asking about that blue top, I recall that she said it was a Marika top that she found herself while out shopping. She got a peach colored one just like it which is in Rhythmic Step. The crew wore Nike tank tops to complement the two Marika tops.
The black longer tank that Cathe wears in S&H is Nike -- I do remember that.
I did a Google search, but not luck at my end. There is a line of clothes called Marika, and I keep getting pants. No Nike Marika top, but let me know if you find out anything.
I checked out marika and nike but those tops are years old and they don't continue those kinds of things. I even looked on Ebay but no luck. I'm not sure I agreet aht the blue (and orange in RS) are Marika. Its not Marika's style at all.