Open interview this weekend but I'm clueless about what to wear.

Yeah, no tucked-in anything. Nothing construed as formal. Not for a craft beer place, let alone in the South. http://images2.chictopia.com/photos/lordofthecakes/9857334679/converse-shoes-j-crew-shirt-j-crew-pants_400.jpg. It's not Super Stylish, but it's not Not-Stylish either. It just kinda says "Hey, I'm an upstanding guy who cares. I'm laid back, but am also responsible. I pay attention to details, but I'm not fussy. I'll treat your customers like friends. I like good beer on hot days, and I probably have a cool dog."

Nice jeans, casual button down shirt tucked in with belt, casual blazer, decent shoes but not dressy and not sneakers You want to look comfortable and stylish, but not over the top.

If they have a website, photos of staff may give you an idea into how they want to portray the "mood" of working at/visiting that bar. Dress like that, but like 15% more formally.

What bartenders and waitstaff wear in the restaurant is a good starting place. Polo shirts are rare; non-knit shirt with buttons is pretty standard. Not white, because white shirts are "part of the uniform" (imagine every swarm of caterers you've ever seen). I'd go with black pants rather than khakis because (a) it's not the middle of summer (b) more formal, and (c) all restaurant staff wear black because lighter colors show spills, therefore black is never too formal in a restaurant. Solid-color button down with black jeans; shoes euro-sneakers or slightly nicer.

That ad sounds like a casting call! I find restaurant jobs to be 95% personality. Figure out their vibe beforehand and emulate that. Upscale? Too cool for school? Hey brau wassup? Preppy? Know in advance whether you want front-end or back-end work helps too. They will train you the skills if they like who you are so don't worry about your level of experience.

Sorry guys. It's the south. And the the servers are mostly female and basically shorts and the bars tshirts with sneakers. Basically it looks like they can wear what they want, with some wearing less than others. The guys are only behind the bar, and wear tshirts with jeans. So far I'm getting no polo, button down, and slim, dark jeans? The only jeans I have are more blue and a little too big. Guess a trip to the store is coming up.

Where are you located? Clothing expectations can be pretty regional.

Assuming you're interviewing to work at the bar, as opposed to a job interview for some other kind of work that is being held in a bar, I refer you to this http://ask.metafilter.com/219716/Job-interview-outift. I'm gathering that you're male, but the spirit of the question and answers may shed some light.

I would lean toward a button down more than a polo, and something with a more modern/slim fit. Could even have a subtle pattern or a plaid (probably not flannel though) but solid is easier to pull off. Tucked in. If you have darker wash, straight leg jeans that would be good, chinos/khakis in a darker color (black, navy, charcoal, dark olive, dark brown) would likely also be OK. Wear a belt. I'm neutral on a blazer, probably not necessary. Leather shoes. I would think this would be pretty acceptable at most/all food service and retail jobs (except really high end), always guided by the "style" of the place. For an office-based entry level job (like a file clerk), you should dress more professionally: at least a blazer and a tie for an interview. Depending on the field (does the boss where a suit everyday?) a suit would not be out of place as long as it fits you and is not wrinkled from being in storage, but not required if you don't have one. No jeans. And not that you asked, but don't be down on yourself about being "too old". I bet the owners and maybe managers are not super young and would greatly value a down-to-earth, mature employee. Just go in there confident and like you belong there.