Travel Advice Required

I thought i was the expert on packing light. Now I am in desperate need of some advice! Does anyone out there have any ideas for me?

• Do I really need my winter pyjamas (weight: 600 grams) when my home will be centrally heated?
• Do I need an umbrella when i'm taking a $500 Gore-tex raincoat?
• How many pink tops & jackets is too many? (please don't say any number less than 7)
• Should I take those trousers that are just a tiny bit too tight, or am I going to stack on the kilos with German cakes and never fit into them in a month's time anyway?