Detective - ignore them. Ignore them all. If you want a home birth, bloody well have one.
In fact, there is nothing to say you can't have your baby wherever you like. Wether that's a phone box in the middle of london or in a hospital, so do what you feel is right for you!
My mum had all three of us at home, and with her last (my little sister) she didn't actually tell anyone until the day she went in to labour because she knew they wouldn't be able to do anything about it!
I would have had a home birth with DD but wanted a pool so I went to MW led birthing unit instead, it was lovely and i'm hoping to do the same again with this one :)
Just don't let it annoy you, it's your labour, your birth and your baby.
WRT changing bags, I just use cheap ones, but have only used two so far. I'd like to be able to spend a lot on one but I couldn't justify it!
As for pj's, get yourself to tesco ladies and grab a pair of the mens lounge pants in a size or two up. They are so comfortable! I have two pairs and love them. I just wear those with various vest tops with hidden support from primark :)