DALLAS, Jan 8, 2008 / FW/ — A slow economy, an impending slash on interest rates, tighter credits and a general downslide of the luxury market, will the coming Fall 2008 season become the acid test for New York designers? During the Spring 2008 fashion season, the New York catwalks were filled with ‘very safe silhouettes’ as designers tried to balance between economic viability and creativity, a reaction to a wavering U.S. economy. For Fall 2008, the situation has become gloomier with high gas prices, a decline in home values and a holiday selling season that is far from being