All airlines require flight attendants to wear uniforms for work. There are usually a variety of style of uniforms to choose from. Some of what you might choose to wear are as follow but not limited to these:

• Blouse and Skirt
• Polo Shirt and Shorts
• Blouse and Slacks
• Dress
• Sweater Vest
• Regular Vest
• Blazers (can be worn with any of the above outfits)

Most airlines will provide some sort of an allowance for uniform. Some might pay you a few dollars a month to go towards your uniform, while other airlines might have a uniform bank, where overtime you order uniforms, they might match you the cost and pay like 50% of your purchase price for the uniform. Not all airlines handle the uniform allowance the same way, some airlines might be better than others.