Cosas or Cossas: How To spell?
The word Cosas is misspelled against Cossas, a noun meaning "Plain India muslin, of various qualities and widths."
Cossas has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings co & as which should not be misspelled with single 'S'
Wrong Spelling:  co-s-as  Correct Spelling:  co-ss-as 
Find more incorrect spellings of Cossas to spell right way.