If your girlfriend has a Pinterest account, congratulations, you've most likely just hit the jackpot. If you're struggling to find gift ideas in the 11th hour before V-day, you can use her Pinterest like a veritable shopping list. She may have pinned items of clothing she likes, but at the very least it will give you a better idea of the kind of things she's interested in that you may have, well, forgotten about. Social media platforms aren't all facebook games and shameless ego promotion, sometimes they actually help you out. Use this to your advantage.
If your girlfriend doesn't have a Pinterest account, perhaps you could persuade her to get one this year. You know, for totally selfless reasons of course.