What should I wear to class or practica?
For classes and practicas most dancers dress informally. It is best to dress comfortably. Loose knits and relaxed, breathable fabrics are always a plus. It is acceptable to wear jeans, t-shirts, shirts, regular or dress slacks, skirts or dresses.

What should I wear to a milonga?

The clothing for the milonga tends to be a bit more formal and fancier. Some even “dress to impress”. Light, flexible skirts or dresses are recommended for women, and dress pants with dressier shirts for gentlemen. Overall, find the right balance between elegance and comfort.

What shoes should I wear?
If you're a beginner, you don't need to purchase tango shoes right away. Other dance shoes like ballet flats, or ballroom shoes, are also comfortable, and street shoes with leather sole also work.  However most dancers find that they prefer tango shoes if they plan to continue dancing for more than a few months.