For a business that concerns itself with fit and figure flattery, it has taken the fashion industry an unusually — some might say, unforgivably — long time to recognize the obvious fact that we are not all the same size. Worse, labels that did address those who are size 14 and over were relegated to a category all their own, as if they were not part of mainstream fashion. Now, however, a handful of pioneering companies are changing that pattern with inclusive sizing that covers both ends of the spectrum. Best of all, these labels don’t make a big show of it. They simply make cool clothes in a variety of sizes.