Tiny onesie, memory for each son (7)

I believe the answer is:

rompers

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'tiny onesie' is the definition.
I can't tell whether this definition defines the answer.

'memory for each son' is the wordplay.
'memory' becomes 'rom' (Read-Only Memory on a computer).
'for each' becomes 'per' (per person).
'son' becomes 's' (genealogical abbreviation for son).
'rom'+'per'+'s'='ROMPERS'

Can you help me to learn more?

(Another definition for rompers that I've seen is " Child's suit".)

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