Dear Peter,
Thank you for your letter.Sorry for not writing for so long.I was glad to get a message from you.(следующее предложение через одну строчку)
In your letter you ask me about my clothes.
The most of all i wear trousers and T-short, because it is my lovely clothes.
Sorry i must finish now, my mum is calling me. I am looking forward to your letter.
Best wishes,
(твое имя)(точку в конце имени нельзя ставить!!!!)
(67 слов если я не перепутал)