It is recommended to take a taxi to Yongle Fabric Market, due to its slightly inconvenient location downtown with no nearby MRT. Simply tell the driver 永樂市場 Yǒnglè Shìchǎng.
Take the Green Line 3 to Beimen station (北門). After exiting the station, continue walking north on Tacheng Street (塔城街) until it changes into Dihua Street (迪化街). Shortly after this change, the market will be very visible on the right side.