あなたが一番好きなワイシャツを選んでください。

you (referring to someone of equal or lower status); dear (what a wife calls a husband)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

number one; first; first place; best; most; game; round; bout; as a test; as an experiment; by way of experiment; by way of trial; tentatively; song (e.g. in Noh); piece

liking; fondness; love

shirt; business shirt; dress shirt

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to choose; to select

to give; to confer; to bestow; to kindly do for one; to oblige; to favour; to favor