Austin hosts 2 festivals in this guide, in Texas: SXSW, Austin City Limits.
Austin has 2 festivals in this guide. They run in March and October, and festival-day temperatures range from 24°C (75°F) to 29°C (84°F), with nights down to 12°C (54°F). That range is the reason there is no single "Austin festival outfit". The answer changes by month and by site.
1 of them runs in real heat (28°C or more), where loose natural fabrics beat coverage and a brimmed hat does more than any garment.
The ground matters as much as the sky. You will find city streets and city park, which puts broken-in trainers or a low boot at the top of the list for most of these events. None of them have camping on site, so you are travelling in and out each day and the outfit has to survive the journey at both ends.
Stylistically the crowd here leans indie, streetwear, urban and alt. Austin City Limits is the largest of them at around 75,000 people, and it sets the tone the smaller ones react to. None of that is a dress code. It is what you will see, which is worth knowing if you would rather blend in or deliberately not.
