Actually in original LD, all clothes have different bonuses. This somewhat hindered player's ability to dress whatever they like. So now clothes are purely aesthetic.
But he is right, at least some clothes should have some effects, like the gimp suit and gas mask. With the ero bonus for some clothes i dont think it is necesary as there is already indecent/nude stat.
Making clothes have bonuses gives each clothing different usage. Or making clothes having no bonuses at all, to maximize player's freedom to wear whatever they like.
There are no right and wrong between these two options.