The expectations around what people wear to weddings have, across the past decade, quietly shifted in ways that the broader formal-wear industry has been adjusting to with mixed success. The shift has been gradual and is most visible at the level of specific decisions guests are increasingly comfortable making.
What has shifted
What has shifted is the implicit dress code. Daytime weddings increasingly accommodate less-formal interpretations than the formal black-tie codes the prior generation operated under. Evening weddings continue to support more formal dressing but with broader tolerance for non-traditional choices.
What guests are doing
What guests are doing in response is dressing more deliberately to the specific event rather than to a generic wedding-formality template. The result is wedding photos that look more varied than the prior generation's; the variation is, on most accounts, an improvement.
What the formal-wear industry is doing
The formal-wear industry has been adjusting at uneven pace. The brands that have leaned into the broader range of acceptable choices have produced more growth than the brands that have continued to offer narrower options.
What this is about
What this is about, beyond the specific question of what to wear, is the broader pattern of contemporary celebration becoming more personal and less templated. The pattern is visible across multiple categories of social ritual; weddings are one of the most public examples.