Sure, but t-shirt and jeans is also what everyone working at an Apple Store wears. It'd be one thing if they didn't say what to wear - then I'd totally understand going a bit above, but if they specifically put in "not formal", then it seems reasonable to assume they mean "match the uniform generally".

I'd mostly agree, but with them specifically calling out "not anything formal" as part of the expectations for interview attire wouldn't be the time I'd want to be riding the line of "is this too close to formal". This isn't a job at a tailor or stylist. You're not being tested on your understanding of the roles of various garments in different levels of fashion over time.

Presumably OP had seen/visited an Apple Store before and knew what employees wore there, so it's not a mystery what the uniform is, and therefore what is probably meant by "don't wear anything formal". It's not some kind of gotcha.

In human dynamics, very little is based on “first principles”. Some words are considered vulgar and others are not. Why? Aren't they just a sequence of letters? They certainly are, but those sequences have been assigned a meaning that does not derive from any “first principle”.

In the Western world, for a long time, at least 100 years, a suit was considered the proper attire for men. Then expectations changed and now some, many even, consider jeans and a t-shirt as aesthetically pleasing as a suit. Maybe in a few years, you'll go and talk to your lawyer, who will turn up to an hour-long meeting that you'll pay 500 dollars for in a tracksuit and it'll be perfectly fine, you'll even find the attire aesthetically pleasing.

Firstly, what we call a suit is a highly varied outfit of clothes that are designed to look good on a male silhouette. Deriving from that, yes, the suit is aesthetically better- to disagree is to discount both the entire field of custom tailoring and also the rest of wider society surrounding tech.

Most people off the street would agree that a suit is more dignified, and it's not without reason. Wearing a suit indicates a level of discipline, effort, and intention about the way that you look that simply wearing a t shirt with jeans does not.

To contrast, the historical reason for the t shirt / jeans combo is practicality and convenience; tech as an industry got away with it at first, because techies were not interfacing with clients directly or simply because they're working class.

You can argue about the elitism and class differences surrounding suits versus t shirts and jeans, but I think it's a bit ridiculous to say that suits aren't aesthetically better just because of the media image for hacker types.

Hehe explain aesthetics from first principles sounds like demanding the equation that proves Mona Lisa is a good painting.

I mean you can argue aesthetics, but it’s a fact that in the western world, a suit is considered by everyone, more or less, to be more formal than T-shirt and jeans, and more formal is widely considered to be more dignified than casual wear. The first principles that matter aren’t aesthetics, they are more likely customs and class (socioeconomic status).