The addition of COPI proteins and adaptor proteins to Golgi membranes during the formation of transport vesicles, forming a vesicle coat. [ https://www.worldcat.org/search?q=bn%3A0716731363 GOC:jid GOC:mah http://www.ncbi.nlm.nih.gov/pubmed/10219233 ]
Synonyms: COPI coating of Golgi-derived vesicle