Eh, I'm of two minds re: suspenders... They are kind of a trend thing right now, ie, skinny suspenders paired with skinny jeans, a tshirt, and a porkpie etc. So if you go that route, I think you'll be ok. but you can't just get some bulky standard suspenders and make it work, IMO, it's kind of a specific look.
Traditionally, suspenders/bracers are for pants without belt loops, and the pants will have buttons on the inside or outside of the waistband that the suspenders attach to. you'll sometimes see this on reproduction jeans, too. You could wear them without a suit/blazer jacket I suppose, but again, I would veer away from purely traditional suspenders if that's something you are gonna do.
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Also,
Dior Homme FW 2012 is gonna make me a broke dude. fuuuu