The dress has some nice features, if you can get yourself into a 1960s mindset - shirt-style collar and cuffs to go with the tie, and the wide point of the tie standing out against the paler pink. And notice that it's worn with white tights, which had a moment back then.
It shows the influence of Mary Quant on 1960s fashions. Here, for instance, is a pattern of hers issued by Patons in 1966:
And you should wear your minidress with a beret.
And to top off the outfit, you could knit the beret. To emphasise that this was a young fashion, the pattern says that the largest size is for a girl of up to 16 years, though in fact a beret that fits a 16 year old should also fit an adult.
My sister, who was a fashion-conscious teenager at the time, had a pink angora dress (short, but with long sleeves) and a matching pink beret, both knitted by our mother. It was very warm and cosy, I'm sure, though it probably shed fibres everywhere. The dress is long gone, but I think I may still have the beret. I shall look.