I'm uncertain how effectively this model will function in practice, but it should be satisfactory.

Erection under clothing, Butt crack, Dick print, Bulge, briefs, Bulge, Boner, Belt, Sagging, below the waist,

0.7 ought to be suitable.

Negative: ripped shirt, if your doing ripped pants

I suggest using "((,))" for sagging, below the waist, perhaps on certain clothing.

And if you put (holding pants) it will 50/50 work