Herein, a 3D textile capacitive pressure sensor constructed from a heterogeneous double-sided conductive knitted fabric and spacer dielectric layers, designed for plantar pressure monitoring. Using bidirectional jacquard knitting, a skin-comfortable, flexible fabric with asymmetric conductivity was developed by incorporating a homemade conductive core-spun yarn. The sensor was fabricated via hot-melt bonding and polydimethylsiloxane encapsulation, with spacer fabric thickness systematically varied to tune pressure sensitivity. The sensor with a 2.36 mm dielectric layer exhibited optimal performance, including a high sensitivity, a response time of 6 s, a recovery time of 4 s, and a hysteresis of 12.93%. Long-term durability was confirmed through 3000 cyclic loadings without significant signal degradation. The fully textile architecture preserves comfort and breathability while enabling reliable dynamic sensing. This work introduces a novel fabrication route and sensing architecture that advances textile-integrated electronics and offers scalable potential for wearable health monitoring, soft robotics, and next-generation smart-garment applications.