Victory drinks in these shirts (1-5)

I believe the answer is:

v-necks

I'm a little stuck... Click here to teach me more about this clue!

'these shirts' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'victory drinks' is the wordplay.
'victory' becomes 'v'.
'drinks' becomes 'necks' (I've seen this before).
'v'+'necks'='V-NECKS'

'in' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app