Dawn Joslin's feet hurt so much last week that she wore sneakers to work for the first time. But there she was at lunchtime, despite corns, bunions and three major foot surgeries, sitting at Lord & Taylor's trying on high-heeled slingbacks. Would they hurt her feet? Yes. Would she wear them anyway? Of course. "I just like the look of them," says the 50-year-old comptroller. "I used to wear the stilettos, but gave those up in my 30s. No doctor has ever told me not to wear heels." Blame Sarah Jessica Parker's Carrie Bradshaw and her Manolo Blahnik obsession (and...