DS is three and happens to love pink. Not worried, it's a nice bright colour. His sister's toys are mainly pink and hold a special allure because they have always been taken away from him as being too small / choking hazards.
He also likes animals. Farm animals especially.
I bought DD (aged 10) a fleecy sleep-suit from Primark which is pink and has sheep on it. For a laugh. She is wearing it around the house and takes it off when she goes to bed.
DS is besotted with it 
and drags it downstairs and hides it in the corner of the sitting room every morning.
Shall I get him some pink sheep sleepwear of his own for Christmas?
I think there are pics of him on my profile. It would really suit him. Not sure what the ILs will think but there you go.