Pipers hose are commonly very thick in the cuff, often white, and generally have a waffle pattern to the cuff.

Pipers sporrans are often military style horse hair sporrans, though different bands use different types of sporrans in their uniforms; when it comes down to it, I don't know that there are many, if any strictly "piper" sporrans.

Piper's and drummer's plaids wrap around the body, and are made with quite a bit of yardage; they really have no place in civilian attire.

Pipers often wear special doublets that are only generally used as uniforms. Many bands can also be seen wearing Argyle type jackets that are identical to civillian jackets.

In the end, it all comes down to what an individual piper chooses to wear, or what a specific band settles on for their uniform.