I think up to 50% Polyestre can be accetable today. Actually Synthetics are alway more durable then natural fibre. They are also less susceptible to wrinkling.

Course they still tend to be a little stiff, but there are nowadays better synthetic-mixed fabrics without the cheapass Polyestre look from 20 years ago. There are even a lot of very price suits with up to 50% Synthetics. Made especially for exhibitions or travellers that have to maintain a proper look after a few hours in the car/plane/train etc.

Its time to rethink some older prejudices. But always avoid the “extremly” cheap 100% synthetics etc. some are still on the market.

2. Yes :-p But if you’re a waiter with training, at least show in black trousers and a perfectly ironed white shirt.

3. Doesn’t matter, as long as you CAN knot it that way. I pretty much always use a pratt-knot, but that’s a personal thing.

4.With those dances, just overdress, everybody does. If you want free range of motion, wear a gilet under your vest so you can take it off without losing style.

2): is it considered “overdressed” to show up to an interview for an essentially glorified coffee shop in a suit and tie?

3): Which knot for a tie is accpetable for an interview, four-in-hand, windsor, pratt, or square?
and
4): As far as dancing (swing, lindy, three-step, etc.) attire goes, what would be an acceptable outfit for a semiformal dance that gives free range of motion, but does not sacrifice taste and class in the process?

Feedback would be much appreciated.
Thank you

Or for example in the UK, cufflinks are accepted if you’re the stylish type, just like a noticeable ring, a personal pen or an expensive watch. Same goes for France. You are allowed to be stylish in those countries, it can even boost your popularity.

But on the other hand, countries like Germany or the Netherlands are a world of difference. They’ll wonder what you’re up to if you wear any kind of accessory other than a wedding ring.

If your career is to be international, please take note of the various cultural differences, they can be huge.

If this is true (and it may not be for professionally trained interviewers), then being well dressed could make a big difference to your chances of getting a job offer; particularly (as Samuel suggests) the competition often let themselves down!