Cloth is always going to be bulkier than a sposie, having said that, I've used all kinds and never had a drama with clothes fitting - but my kids are scrawny creatures.

Audax has pretty much summed it up. Sized nappies are generally trimmer than OSFM too. Sometimes though a heavy wee'er is not such a great match for trim nappies, so maybe wait and see what your little one is like first?

ETA must come and join in your BB group. My bub will be here in the first half of Feb, so should get to know you guys too I think