Step 25: Draw the abs under the rib cage as a series of curved lines. The curved lines should divide the abdomen into four separate shapes. Don't draw them too low. Follow the initial guides to draw the sides of the torso but make the lines curve more as you darken them.
Step 26: Add Batman's belt by first drawing a small rectangle right below the abs for the buckle. On either side of the buckle, draw a thinner rectangle for the pouches where Bats keeps his gadgets. Add a curved line on top of each rectangle for the pouches' flap covers. Add another pouch on either end of the belt but make them thinner.
Step 27: Use the initial triangle-like shape as a guide to draw the Dark Knight's underoos. Follow the basic path of the guide but make the lines curve more as you darken them.
Step 28: Use the long U-shaped arcs under the torso as guides to draw the top part of the legs. Follow the basic path of the guide but make the shapes bulge out more to emphasize the muscle structure. Draw a diagonal line at the top to further define the muscles on the leg. Draw the leg on the right side the same way, only this side should be the mirror image of the left side. If you'd like, you can make the legs more muscular by drawing the shapes wider than the initial guides.
Step 29: Use the remaining shapes at the bottom as guides to draw the rest of Batman's legs and feet. Follow the path of the guides and darken the outer edges to create the shape of the rest of the leg. Add an extra line at the bottom of the foot for the shoe's sole and a smaller line inside for the bend on the shoe.
Draw the leg on the right by using the initial shapes as guides. Darken the outer edges of the initial shapes to create the leg. Add the lines to feet too. Inside each small circle in the middle, draw four tiny lines to indicate the knees bulging out. Below each knee, draw an angled line for the top part of Batman's boots.