When it comes to pairing trainers with a suit, a man must tread carefully.

Executed properly and they'll lend a laid-back, sporty contrast to your tailoring. But used poorly and you'll just end up looking like that one weird uncle at the wedding who hates dressing up and is trying (and failing) to be a bit subversive.

SEE ALSO: Why You Should Embrace Trainers With Suits

Orlando Bloom falls into that second category with this one, we're afraid.

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Bear Grylls//Digital Spy

Attending a dinner thrown by H&M last night, Orlando tries to dress down his black formalwear with a pair of Nike Air Force 1's, a classic style that would be perfectly acceptable in a casual jeans and bomber jacket setting, which this wasn't...

The first issue arises in the fact that they're high-tops, meaning that his black trousers end up spilling over them; ruining any sense of fit and structure and instead making the whole thing look a bit sloppy.

The second is that, as a basketball shoe, the AF1's are chunky and hard-wearing, a shape that looks immediately out of place when matched up with the shape of a well-cut suit.

Usually a sharp dresser on the red carpet and beyond, we can see what Orlando's trying to do here, but if you do want to add some flair to a somewhat unexciting suit, then your best bet is to opt for derbies in patent leather and either a crepe or commando sole. Or, if you'r hung-up on trainers, stick with slim, low-profile tennis shoes that don't scream for attention.

Also bear in mind the fact that trainers work better with more casual colours and cuts; think lighter shades of blue, stone grey and tan, instead of black.

See below for an example of when Orland got the tailoring and trainers look right.

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Bear Grylls//Digital Spy

That's better...