High fashion always seemed to be for the thin. Plus-sized clothing and maternity wear seemed, in my eyes, always eternally mumsy. A Telegraph reporter calls it rather formal and mother-of-the-bride-ish A growing population is putting fashion designers and shops on the spot. Marc Jacobs is tweeting about a plus-sized range, US store, Saks Fifth Avenue, is adding bigger sizes to its designer third floor instead of hiding them away in a special department. UK retailer,