No, it can't. Maybe you have a fairing, but ride for 2+ hours in a heavy downpour and those zippers will leak. Everything does, sooner or later, and for a WP suit that is also protective without WP liners, it is really, really hard to top the RC. It doesn't take much water to make your whole arm or chest wet, and in 40 degree weather like we have now that's a major problem. I've been through some crazy stuff with my one piece with the RiRi zipper, and its been fine so far. I hear the fabric becomes less WP over time, but I haven't seen it yet, except for a couple spots where the DWR doesn't work quite like it did new. (that is, water doesn't bead, but still stays outside the goretex). Aerostich will know for sure, but if I had to guess, I'd say you probably need to go to the two piece light (or: the RC city) for alterations.