The Japanese economy has hit the skids, but the slowdown hasn’t hampered cosmetics sales. Japan’s cosmetics industry has posted sales gains for 22 months straight. Fuji Keizai Institute, a Tokyo consultancy, predicts sales will edge up 3% this year, to $24 billion. (Fuji Keizai’s estimate of the market’s size is much higher than the government’s official $16.5 billion figure.) The trend is even more surprising because there are 1.8 million fewer Japanese in their 20...