No. If you have issues with her weight discuss them honestly- although be prepared for her to decide she is no longer interested in you. If you love her, you need to accept her as she is. If she wants to lose weight, be supportive - but buying her a dress that's too small seems fairly passive-aggressive, not kind and loving.

Nooooooooooooooooooooooo! don''t do it. I Put down the credit card... turn around slowly and walk away from the shop. Its really not a good idea at all, all you'll get is a resentment and a fight.

If she doesn't pick up on the 'hint' to lose weight she'll think your a jerk for not knowing what size she is.
If she does pick up on the 'hint' she'll think you're a jerk for trying a) calling her fat, and b) bullying her into losing weight by calling her fat.

The only time this would be acceptable (and safe for you) is if it is completely 100% her idea. Even a 0.0000001% hint from you will make you the 'jerk' so don't even consider it.

That's an appalling question. Do you or do you not love her for who she is? This is absolutely a horrible idea.

Not if you want her to stay your girlfriend for long.

Buying someone a hat doesn't make a bigger brain nor does it make anyone smarter.

It wouldn't work anyway, she'd just tell you it doesn't fit and would ask you to return it to the store for the proper size. Unless you're brave and insensitive enough to actually tell her she needs to lose weight.

Don't buy the dress. Instead, casually take out a photo from when you two started dating or whenever she was at a smaller size (if this is possible....because if she was always the size that she is now, then you'll have to figure out why the weight bothers you more now than before) and casually compliment her on how great she looked in that photo. If she's paying attention, she will probably realize that she looked much different before and will decide to lose weight and go a few sizes down on her own.

You can also start a brief workout routine and ask her if she'll join you.

While it's best to accept a significant other as she or he is, that also doesn't make it OK for people to gain dozens of pounds and expect you to still be attracted to them anyway. A few pounds is one thing, but a drastic weight change is another story. I don't know which category your girlfriend fits in so I cannot really help you there. Did she go from Halley Berry to Serena Williams or the post-marriage/post-motherhood version of Kimora Lee Simmons (which is not all that bad and maybe you should get over it) OR from Nicole Richie to Kirstie Alley (which may be a cause for concern...maybe she's depressed, or did you two have and babies?) ?

The two suggestions here (workout routine or old photo compliments) are still better than buying a dress that's too small because if she can't wear it, then you've just wasted your money and she'll probably remain the same size.

Weight does not matter to everyone, but if it matters to you, then it matters....bottom line. I don't think you're insensitive at all.

You have quite a bit to lose and nothing to gain. Don't do it. Not only is this passive aggressive; it's not going to work, either. Even if it did, none of her other clothing would fit. Does she even want to lose weight? Even if she does, this isn't going to help.

If this is really important to you, why don't you work on your own personal fitness and try to inspire her to get involved along with you?