Hi mamaS,
I'm a big fan of bambino mio covers. For a while I used just terry towelling flat nappies that I bought from Mothercare, with snappis (rubber hook thing instead of safety pins) and the bambino mio covers.
The covers are excellent, as they have leg guards/gussets that help to keep everything contained. I really, really like them! My only complaint would be the very limited range of prints and colours. I think I purchased mine from Eugene Baby Club.
The nappies are prefolds, is that right? Like, a muslin sort of fabric sewn together. That would be similar in practice to using the terry flat nappies as I did. I think it would be fine, but I did find eventually that I preferred to use fitted nappies with the covers, because it provides that little bit extra protection, with the elastic on the legs. With bambino mio I never had leaks out of the cover, so no wetness on the clothes, but within the cover, I had poo leaks, which you then have to clean off the cover and that's annoying. As far as I know there are no fitted nappies you can purchase from a real store in Hong Kong, though there are online stores.
For Hong Kong weather, a flat nappy and a cover is very good, in terms of drying, so bambino mio would suit that purpose. I also love pocket nappies, because they are much more convenient to use, and they dry just as quickly. If you stuff the pockets as they come out of the wash, they are ready to put on and it's just as easy as using a disposable, no covers or pins needed.
I got some of my pockets from Australian stores, and also from the HK vendor Nappy Pooh. Have you already had your baby or are you currently pregnant? I can also recommend the bambino mio flushable liners. They really make life a lot easier when using cloth nappies.
HKAussie