The Office Where Jeans Are Now Normal, and the One Where the Sweatpants Are a Trap

🇬🇧 UK · 🇨🇳 China

By Priya Mehta, The Global Office

In July 2025, just 3.3 percent of UK job postings referenced casual dress — more than ten times the pre-pandemic rate, per Euronews reporting, and a fair snapshot of how fast British offices have loosened up. In China, the picture is split rather than shifting: one tech employee arrived at a new job in a collared shirt and jeans only to find the boss dressed in sweatpants and slippers, while a colleague in finance down the street would be expected in a full suit for the same seniority. The lesson for anyone relocating is the same in both countries, delivered two different ways — the dress code is never really about the clothes, it's about which tribe within the office you're signaling membership in.

Do's & Don'ts

🇬🇧 UK

🇨🇳 China

UK: A Fast, Uneven Loosening

British dress codes have moved further and faster than most people clocked. DavidsonMorris's 2026 guide describes the traditional suit-and-tie standard as no longer the default anywhere outside a shrinking set of formal sectors, a shift Euronews ties directly to Gen Z and millennials moving into positions of influence and bringing tech-industry casualness with them. The change isn't uniform, though — job-posting data shows striking regional variation, with Northern Ireland, North West England, and the East Midlands recording the highest share of postings mentioning casual dress, while London sits at just 2.3 percent, a gap DavidsonMorris attributes largely to the capital's concentration of financial services roles, where formality has held on.

The generational and enforcement splits underneath the averages are sharper still. PA Life's workplace survey found a striking age divide: the overwhelming majority of people who described their dress code as "completely relaxed, no implications" were under 35, while over 41 percent of those describing their office as still strictly "smart" were 35 or older. Enforcement isn't gender-neutral either — the same survey found more than twice as many women as men reported having been "dress coded" and asked to change or cover up at work, a data point that complicates any simple story about offices universally loosening up.

China: Formality as a Map of Hierarchy and Sector

Chinese workplace dress code splits cleanly along two axes that don't always align with what a newcomer expects. HROne's guides describe traditional sectors — finance, law, government-facing work — as running genuinely conservative: suits for men, suits or knee-length modest dresses for women, muted colors, and white avoided as a primary garment because of its association with mourning. Layered on top of sector is hierarchy itself: Confucian-influenced norms around presenting oneself with respect for superiors mean senior staff and government officials often dress more formally even in offices where junior employees have more casual latitude, a pattern that inverts the Western instinct to assume seniority buys the right to dress down.

Tech is the genuine wildcard, and it catches newcomers off guard in exactly the way Blind's community describes: one poster recounted showing up to a new tech job in a collared shirt and jeans, trying to look appropriately professional, only to find their boss in sweatpants and slippers — a casualness that, per HROne's reporting, wouldn't be anticipated without direct experience of the sector. The friction point comes when the two worlds meet: engineers used to that laid-back tech culture can find themselves genuinely underdressed the moment they're pulled into an onsite client meeting with a more traditional counterpart, a gap that produces exactly the kind of embarrassing mismatch eChinaCities' career guides warn new hires to plan for.

The Reckoning

Both countries have a formal tier and a casual tier operating simultaneously — the difference is which variable sorts you into one or the other. In the UK, it's largely sector and region: finance in London stays buttoned-up while tech in Manchester goes casual, and the split tracks industry more than anything else. In China, sector matters too, but hierarchy cuts across it in a way the UK's flatter dress norms don't really have an equivalent for — a junior employee at a Chinese tech firm might dress more casually than their UK counterpart, while their own boss, in the same office, dresses up specifically because seniority still expects a visible marker of respect.

The Part the Brochure Left Out

Blind (teamblind.com) — A tech employee described arriving at a new Chinese company dressed in what they thought was smart-casual professional wear, only to discover their boss in sweatpants and slippers, and said it took weeks to recalibrate what "dressing appropriately" even meant in that specific office.

Quora — Someone describing UK business casual norms said the safest baseline was pressed trousers, proper shoes rather than trainers, and a collared shirt — adding that erring slightly more formal than colleagues on day one is far less awkward than the reverse.

eChinaCities (career advice, paraphrased) — Guidance aimed at foreign hires in China warned that engineers accustomed to a casual internal tech-office culture were sometimes caught visibly underdressed when suddenly pulled into client-facing meetings, since the two contexts required completely different registers of formality.

PA Life workplace survey (paraphrased) — Respondents under 35 were far more likely to describe their office dress code as entirely relaxed with no real implications, while colleagues over 35 in the same broad workforce were more likely to describe a persistent "smart" standard — with women substantially more likely than men to report having actually been challenged over what they wore.

r/AskUK (paraphrased from broader forum discussion) — One commenter noted that London finance offices had barely moved on formality in a decade, while a friend at a Manchester tech startup hadn't owned a blazer in years, arguing "business casual" had stopped meaning one thing in the UK a long time ago.

Conclusion

If you're heading into a UK office, find out your specific sector and city norm before assuming the wider "business casual has relaxed" headline applies to you — London finance is still London finance. If you're heading into a Chinese office, separate the sector question from the hierarchy question: a casual tech floor can still have a formally dressed boss, and a client meeting can require an entirely different outfit than the one that got you through the week. The honest version, over a drink: in the UK, the dress code tells you what industry you're in; in China, it tells you that too, but also exactly where you stand in the room.