Suit trousers, while smart for formal occasions, are rarely flattering to the package. If your outer garments are correctly sized and fitted, you can go 'commando', and not wear any underwear. But if you prefer underwear, choose Y-type briefs, trunks or boxer briefs that support and 'lift' the package, while not constricting it. Speedo-type briefs are usually too tight, and boxers too loose, to show off the package to best effect though loose boxers in well-fitted jeans can work quite well.. If you want to make the package more prominent, wear an adjustable leather cockstrap around the base of your scrotum and penis you might want to trim your pubes to avoid any snagging and discomfort.