Five Common Fashion Mistakes that Wedding DJs make

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These days, not all weddings are formal occasions. I've done a few weddings where I had to remove my tie because the wedding party was more casual.I think it's most important that the DJ not out dress the wedding party. Or to come under dressed. There is no standard "uniform" that works for every event.
 
I think the parts about well fitting clothes and proper grooming are somewhat universal. I also agree that logoed clothes is tacky at a wedding. I think in Nick's advice on suits is fitting for his higher-end Jersey market but it doesn't fly everywhere. For instance, I once did a tropical themed wedding where the wedding party was in Hawaiian shirts. I was in a nice black silk Hawaiian shirt too with black slacks and decent shoes. A suit would have been inappropriate.

There is a field of study called NLP (Neuro-Linguistic-Programming) in which you pay attention to your audience's vocabulary and use similar vocabulary to create better bonds. If your client says something "sounds" good to them, they are indicating an auditory preference. You might then say that you "hear" what they mean rather than you "see" what they mean. It is all very subtle. I believe the same is true with clothing. Know your audience and fit in. As Ausumm suggests, one should never over-dress the wedding party or under-dress the guests.

Anyone remember the days where most DJs wore tuxes? I can't tell you how many times I was at non-black-tie affairs where a tux got me confused with a server. It makes sense because that is the group my clothes fit in with the most. I stopped making that mistake decades ago.
 
I think if you're clean, wrinkle free, and carry yourself well, just about anything will work. My default is black dress pants, a long sleeve button-up shirt, and a tie. I talk to the couple before the wedding and see what the clothing situation is going to be like at the wedding (If I'm doing ceremony stuff) and the reception. Around me, a lot of folks, like others have mentioned, have barn weddings now, and the Groom/groomsmen dress in boots, jeans, and a dress shirt. Guests wear anything from shorts to jeans to suits. My goal (personally) is to blend in when it comes to clothing, and only stand out when it comes to entertaining. :)
 
Nick's version of this is almost exactly what I do personally. Except, I normally won't take my jacket off even if the groom does unless it's particularly swampy.

I switched to an Indochino suit this past year that I'm wearing for most events. And I've got a pair of shoes from Thursday brand that have a rubber sole but leather construction so they are a bit of a mid-point sort of shoe. They save me on the very frequent concrete floors I work on.

Unless I'm told otherwise, I assume a suit is always the appropriate dress for a wedding. You can always ditch a tie, or roll up sleeves. But if you didn't take the right outfit in the first place it's almost impossible to dress it up further in the moment.
 
Better to be overdressed than underdressed. I always bring 2 suits, and 2 shirts (plus backups, but that's a different story). I always have a dinner jacket/tux pants and a regular black suit depending on the level of formalness. I also have a white shirt and black shirt. This way between the combination of jackets and shirts, I cover a wide range of dress codes. Granted, I tend to perform at very formal weddings, so I'm almost always in a dinner jacket/white shirt combo, but my sweets are a little less formal... although girls are in dresses and guys are at minimum in khakis and button down... so for those I wear a regular suit with just a black shirt, no tie.

And yes... please tailor your suits. Don't have to buy custom made... but with how cheap they are relative to an off the rack suit, it doesn't make sense not to.