Great to see you again, John! :-)

A "big girl's blouse" is hard to paraphrase in any sensible way. It could mean a man who's not currently behaving as a man's man, if you know what I mean. If a mate of yours is being a bit of a big girl's blouse, you and your other mates will be giving each other knowing looks and wondering when the big girl's blouse in question is ever going to man up. It's a bloke who's fretting openly and fussily about pointless trivia with his mates, such as worrying aloud in the pub after six pints whether his wife's having an affair. Grown men have got better things to worry about, but the big girl's blouse doesn't realise it, and goes on and on about it, boring the arses off his mates. That sort of thing. Hope this helps.