It illustrates that childhood is often the best part of our lives and our adult lives may be disappointing by comparison. The first three stanzas have a hopeful and excitable tone and tell of the persona looking back on his childhood.
This is also seen in the simile 'I smiled as wide as a child who went missing in the way home from school', the poetic voice is still unconsciously linking themselves to being a child again.
The lexical field is evident within the phrase: 'The blazer.
My mother kept my mascot Gonk on the TV set for a year. Their outdated knowledge is met with confusion and people often misunderstand him.
In class, the white sleeve of my shirt saluted again and again.
The length of the poem also suggests that the poetic voice remembers the memory fondly or that the memory was from a long time ago.