The best idea I have is to buy jeans and other pants with a bit of stretch in them, that way, when they start to get a bit loose, they'll still stay on.

You could probably get away with buying either mid-rise or low-rise stretch jeans, boot-cut style and be able to wear them for quite awhile.

Other than that, you might want to consider buying new clothes at the discount stores since you won't be wearing them for long. If you buy simple styles and stick to classics, you'll be able to make these things look more expensive than they really are. You can always dress up outfits with luxe accessories - nice shoes, pretty scarves and a good handbag.

Happy shopping