Oh sod it, if you try them on and they look good, just wear them. Wear them while you are still young and you still can. To hell with what other people think. Sure, if you are squeezing some thunder thighs in to them like overstuffed sausages, they probably wont look good, but if you have a good figure and are simply trying to work out if people will be sneering at you, I suspect not, generally, in real life, seriously, they are white jeans FFS and it is summer, wear them.
I know skinnies are a law unto themselves too never mind them being white but even so - if you are unsure, get your mate to take a photo of you on her phone and then email it to yourself and if you still think you look good you probably do, enjoy it!