in love

in one's birthday suit

in operation

in order

in question

in series

in sight

in situ

in small stages

in stock

in store

in straitened circumstances

in style

in the altogether

in the buff

in the flesh

in the lead

in the public eye

in the raw

in their right minds

in use

in vitro

in vivo

in vogue

in writing

in your birthday suit

inaccessible

inaccurate

inactive

inadequate