A method for creating a series of size-proportioned trouser bottoms comprises each of the slack bottoms being approximated as a cylindrical surface transitioning into a circular conical surface. The back lower portion of the circular conical surface is trimmed along a cutting plane to produce a parabolic-shaped rear edge, to provide rear clearance above a shoe heel. The front lower portion of the circular conical surface is trimmed along second cutting plane producing a unique parabolic-shape front edge for clearance above a shoe throat. Trimming may be by a CNC fabric cutting machine, using the descriptive geometric definition of the circular conical surface, (x/α)2+(y/β)2(z/γ)2=0, and using planar cuts for the parabolic edge trim defined by the equation, Ax+Γz+Δ=0. The defined surface may be unwrapped and supplied to the CNC machine as a flat pattern.