I'm also a pear shape.
Dresses and skirts will be much better for your shape than trousers, and there are plenty of flared dresses on the market at the moment.
Here are some ideas:
THIS with a navy blazer over the top, some nude tights, and navy ballet pumps. The wrap top is good if you are pumping milk during the day.
THIS with black ballet flats and a soft black cardigan
THIS with the same as above, or a pale dove grey cardigan and black flats, or a cream cardigan with cream flats. Or a navy blazer (as per dress 1) and cream flats. Lots of styling options.
THIS with black flats
THIS with cream flats and a string of pearls (even fakes look fine). The ruching around the stomach is actually quite flattering, and the skirt isn't tapered, so more flattering for pears.
THIS with black or cream flats The wider top half will help to balance out your lower half.
You can also get one decent blouse in cream, and then pair it with any number of high waisted, flared skirts. I just checked the skirts page of john lewis, and they're not in short supply.
The good thing about dresses and skirts,etc, is that they are so easy to look smart in. All you need is a non fussy hair do, a tiny slick of make up, and some decent earrings or a necklace, and you are pretty much done.