Aussie bum fall down your ass continually...theyMOST uncomfortable pants on the market...
Trunks I find are great when you first put them on and then after an hour or two, the crothc area "gives" and you have the support of a boxer -nil!!
C-in2 have a great range of smaller styled briefs (not so old man-nish) and slips with a bulge inducing shape to them, I like them at the moment, some even come with an in-built cockring/sling for maximum definition, you can get them from
Skiviez | The Men's Underwear Authority | Home as you can many other styles and brands.... the colours of C-in2 are also good, but then at skiviez you'll see lots of funky colours....
Good luck, the perfect pair of pants is like a fine vintage wine...you just have to keep trying until you find the one that suits you!