First KAL

Yay so excited about this KAL project. But first, I must finish some of my UFOs before embarking on my next journey. There's no time limite and you can start as and when you are ready. Marvelous! The yarn use is Adrienne Vittadini Dianna (51% cotton and 49% microfiber) but I don't intend to follow actually what it calls for. So please give me suggestion, can I use 100% cotton or choose another yarn with similar percentile?