I'm 7 lbs from goal, but on a short person such as myself that can make a big difference in clothing size ^_^
I think it's a tiny bit risky to buy clothes for goal since you don't know where the lost weight will come from. I always considered myself hourglass-shaped until about 5 lbs ago, when I shrunk a cup size! I'm definitely a pear, with a bottom half destined to be more stubborn to shrink than my top.
That said... clothes that "almost fit' you at 155 surely will look quite good at 140! A couple pounds ago I bought a pair of jeans that are too tight to be good for my circulation; I can barely get them on. I certainly think in 7 lbs they'll fit pretty well.... we'll see.
So it's a bit of a risk, but it's a fun motivator, so why not