I bought the most lovely warm winter coat off of Zulily. Brand is Momo, which you can't get in the UK. Price included all taxes as shipped from US. Shipping was £3.99. Just thought I would recommend as I couldn't find a down filled maternity coat in the UK.
I just wore a normal coat, wore open and added a thick scarf to cover the gap/ bump at front. No additional cost of you already own a large scarf, otherwise buy a large scarf but can wear for years after
I then did the same with baby in a sling and wrapped scarf around baby and sling
Damn it sepa, I wanted that coat but when the weather turned I was getting desperate, they were sold out in all but xl! I had to buy a more expensive one from topshop.
I think if you can make do with a normal one great, I really resented spending the money (ds was a September baby so I didn't need one last time). But my normal coat was getting too small all over due to weight/water, so my arm movement was getting restricted, and even with a scarf on I was not warm enough with it open. I spend a lot of time outside with my 3yo in all weathers, I need two hands for most things and can't be constantly rearranging various layers. So although I really didn't want to part with £70, so far it's been money well spent. If I don't have any more dc I can sell it.
A way to shop the scarf and open coat moving is to add a large belt over the top. But that obviously depends on bump size. Ds1 was born in February but my bump was still fairly small over December/ jan/ feb
I bought one from Vertbaudet using their 30% voucher so about £70. I agree it's expensive for a maternity coat (£100 before discount too) but it's one you can wear after maternity too and has a cover for a sling, so I'll give it a whirl. I plan to look after it well and eBay it after!!
Another vote for the h am m parka. I'm 33 weeks but been wearing it for a while and because it has the drawstring I could pull it in a bit. It's great now the weather is getting miserable. I got the m and am usually as 12-14 and it fits fine, probably a bit big but means there's room to wear jumpers underneath it
Ah, I'm a 12-14. Maybe I should have got the M one and not large. Oh well, if it's way too big I will send it home. The sizing was confusing as my bump made me really big by the measurements but they don't tell you how to work out for pregnancy!