Traditional, classical music orchestras are typically a black tie affair, so something more exuberant like these plaid pants is most likely referring to one of those swing music orchestras. These are all big assumptions to make based on a name though. They're pants; it doesn't matter what your preferred form of musical collective is. They still work like pants.
If a size is not listed, it is sold out.
Heavy weight cotton/poly 5 pocket pant
Relaxed fit through thigh into tapered leg opening