As I said,you just need two ingredients.All purpose flour and cornflour.
Measure out 1 cup of all purpose flour.
Remove 2 tbsp from the measured flour and
add 2 tbsp cornflour*.
Sift together for 3-4 times so that both the flours are mixed well.There,you have your cake flour.Now go bake the cake and eat it too!!
*I ran out of cornflour,so substituted it with Vanilla flavored Custard powder.Did that make any difference to the final product,ie the cake I baked?Stay tuned and I'll let you know;)