Starts trying on glamorous swimming costumes (4)

I believe the answer is:

togs

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'costumes' is the definition.
The answer and definition can be both related to bodily activities as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?

'starts trying on glamorous swimming' is the wordplay.
'starts' says to take the initial letters.
The first letters of 'trying on glamorous swimming' is 'TOGS'.

Can you help me to learn more?

(Other definitions for togs that I've seen before include "Clothes (sl.)" , "Clothes (informal)" , "Swimsuit" , "Gear" , "garment" .)

I've seen this clue in The Irish Times.

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