The duty uniforms first appeared in the first pilot episode "The Cage". They
were later re-used for the second pilot episode "Where No Man Has Gone Before"
and briefly appeared in "Charlie X" and "The Trouble with Tribbles". The
dress uniform briefly appeared in "The Cage". The hat was seen in Capt. Pike's
quarters and could very well be part of the field uniform. It appears to be a
USMC hat with a United Earth logo. The cadet uniform first appeared in "Shore Leave". It was later re-used in
"Wolf in the Fold" and "The Troubles with Tribbles".