> pww("twill_herringbone", "1/3", nrow = 15, ncol = 9)
/ - - - - - - - - - \ 
| X   X X X   X X X | 
| X X   X X X   X X | 
| X X X   X X X   X | 
|       X       X   | 
|     X       X     | 
|   X       X       | 
| X       X       X | 
|   X X X   X X X   | 
| X   X X X   X X X | 
| X X   X X X   X X | 
| X X X   X X X   X | 
|       X       X   | 
|     X       X     | 
|   X       X       | 
| X       X       X | 
\ - - - - - - - - - / 

