Concrete Filled Double Skinned Steel Tubular (CFDST) composite column is an extended form of Concrete Filled Steel Tube composite column (CFST) for enhancement of strength owing to the improved confinement of concrete over CFST column sections. CFDST column has a higher strength-to-weight ratio and reduced space utilization. However, the casting of CFDST columns offers a challenge in both vertical and horizontal casting positions leading to concrete imperfections; circumferential and rectangular or spherical. This might lead to an overestimation of load carrying capacity of the column section and premature local buckling of the outer steel tube. In the present study, 09 nos. of CFDST column test specimens including non-concrete imperfection CFST and Hollow Steel Tube (HST) are fabricated to investigate the influence of parameters like circumferential concrete imperfection gap ratios (1.1% and 2.2%), rectangular concrete imperfection gap ratios (4.4% and 8.8%) and shape of inner steel tube (square and circular) on ultimate load carrying capacity, confinement of concrete, ductility, and behaviour of CFDST column. It is observed that concrete imperfection leads to a ~ 19% moderate reduction in load-carrying capacity of CFDST column test specimens vis-à-vis non-concrete imperfection column test specimens.