If you really want to make an impression, try stuffing the girl's pants and you stuff your shirt with two wool balls (make sure to wear a bra, or your "tits" will eventually fall and look extreeeeeeeeeeeemely saggy)

Anyway, for creating a bulge, I would only suggest the socks if what you're looking for is just the lump look on your crotch. If what you're thinking about is the hose pipe running down your thigh... hummm, I guess there are some things callled penis extenders that could help. You'd have to invest some, though
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Penis Extender - Funny Pictures

if you want to save money... I don't know, use your imagination... fill up a condom with gelly, run some kind of string, strap or rope through the base and wrap it around your waist