Crossword Genius

Fret, every so often, about this light garment (6)

Ross

I believe the answer is:

tshirt

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

'light garment' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'fret every so often about this' is the wordplay.
'every so often' means one should take alternating letters.
'about' indicates anagramming the letters.
The alternate letters of 'fret' are 'rt'.
'rt' mixed up with 'this' can make 'TSHIRT'.

Can you help me to learn more?

I've seen this clue in The Irish Times.
Want a hint initially instead of a full solution? Install my app