How about those lacy briefs. You know the ones that resemble boxers. They are very comfy and generally have no elastic around the thighs. But usually look best on a petite woman. Where as a thong can look sexy on a lot of body types. Did you ask your wife? Maybe she has a preference. As a gift it is definitely best to go with what you know she will love to wear.

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Never say never, but if you do it's okay to change your mind~me, I think