a is the overall level of a person attractiveness. x is the constant for overall physical appearance (simplified model), and v is the variable of the tshirt model (influenced based on, say the depth of the v neck) and o is the variable of other clothes worn together with the tshirt. Equation is a=1/2{x+1/3(v)+2/3(o)}*2, take first order condition with respect to v to see the optimum v depth for the best result in a person overall attractiveness. assuming that a tshirt is weighted as one-third of a person overall clothes.
- Wibowo Suhaidi