Having done mother of the groom and will never be the mother of the bride I hadn't really looked at this section of the site before.
My first reaction was that they were desperately safe and conventional and as a result, rather dull, my second reaction was that they all had clearly defined waists, something I notice because waisted clothes have never suited me and as a significant number of women put on weight as they get older, not very flattering to fuller figures.
I suspect from the accompanying text they were aimed at MoGs going to one of those 'no expenses spared' venue weddings, something I have not experienced. All the weddings I have been to in recent decades, including DS's, have been on the Bohemian alternative side.
For DS's wedding after failing to find anything in the shops I liked, I resurrected an unstructured raw silk suit I had bought for a different occasion a few years previously, bought a new top and new shoes and had a few roses dressed into my hair, so no hat. All done with happy agreement from the bride and her mother.
I think people get far too hung up about these occasions. Just go out and buy a dress you like and forget the event. The result will be you will be comfortable and confident in whatever you are wearing and as a result, whatever your choice it will look great on you.