Meaning: The colors of the clothes did not fade after being washed.
Choice of Words: Post-wash: after washing; Remained: continued to be; Colorful: full of bright colors.
Alternative Expressions
Clothes remained colorful after being washed.
Meaning: This means that the clothes didn't lose their colors when they were washed. They are still as colorful as they were before.
Choice of Words: The word remained means that something has continued to be the same or in the same state. Colorful means having lots of different colors. Post-wash means after the process of washing has been completed. When you put them together, "Clothes remained colorful post-wash" means that the clothes kept their colors even after being washed.
The clothes didn't fade after washing.
Meaning: This means the same as the first sentence. The clothes didn't lose their colors when they were washed.
Choice of Words: The word fade means to lose color or brightness. Didn't means the opposite of did, so didn't fade means that the clothes didn't lose their color. After washing means after the process of washing has been completed. When you put them together, "The clothes didn't fade after washing" means that the clothes kept their colors even after being washed.
The washed clothes were still bright and vibrant.
Meaning: This means the same as the first two sentences. The clothes didn't lose their colors when they were washed.
Choice of Words: The word washed means that the clothes have been cleaned with water and detergent. Still means that something continues to be the same or in the same state. Bright means full of light and color, and vibrant means full of life and energy. When you put them together, "The washed clothes were still bright and vibrant" means that the clothes kept their colors and brightness even after being washed.