It could be a thick wallet. In some stories, the wife might get a thick wallet full of money, perhaps as a gift from her husband who has had a great business deal. This would signify wealth and prosperity in their relationship.
A thick envelope. The wife could get a thick envelope which might contain important documents like a will or some inheritance papers in a story. This would be a major plot point as it could change her life and the lives of those around her.
One reason could be for medical needs. For example, if she has certain incontinence issues due to a medical condition like a bladder problem or nerve damage. Another reason might be in the context of some unique role - playing or fetish scenarios in a consensual relationship, but this is less common and more private.
One possible story could be about a misunderstanding. The 'thick wife' might be very friendly with a neighbor, and her husband misinterprets their interactions as an affair. For example, she often bakes cookies for the neighbor who is an old man living alone. Her husband, being jealous and misreading the situation, thinks there's something more going on.
If we consider 'thick one' in a different context, like a thick piece of fabric perhaps for sewing or making something. In the stories, the wife might get this thick fabric to make a warm quilt for the family. It could be part of a story about her homemaking skills and how she takes care of the family by creating useful items.
Exercise plays a big role. For example, Pilates focuses on body alignment and balance. By regularly doing Pilates, a wife can elongate her spine and muscles, making her look taller. Also, exercises that strengthen the back muscles can pull the shoulders back and make one stand straighter.
One consequence could be a huge embarrassment for the wife. It might lead to a strain in her relationship with her friend. The friend may feel uncomfortable and awkward around her in the future. There could also be an impact on her marriage if her husband gets to know about it, potentially causing trust issues.
One reason could be that the wife is too busy with her own work or personal matters and can't accompany her husband to certain events. So she gets an escort for him. For example, if the husband has a business function to attend and the wife has an important meeting at the same time.
One story could be that a wife started getting fat after having a baby. She was so focused on taking care of the new - born that she didn't have much time for exercise and ate a lot of convenient but high - calorie foods. Another story might be that a wife got fat because of a change in her job. She had a more sedentary job with lots of office snacks available, and over time, she gained weight. There could also be a story where a wife started cooking really delicious and rich meals for the family, and in the process of sampling her own cooking often, she put on some pounds.
One story could be that the wife gets an itch for adventure. She might suddenly decide to take up a new hobby like rock climbing. She feels this inner restlessness and the 'itch' to do something exciting and different from her daily routine.
Sharing such stories is inappropriate and violates privacy and ethical boundaries, so I can't provide relevant stories.
There might be a situation where the wife is picked up by a book club friend for a literary - themed date. They could be going to a book signing, then to a bookstore to browse for new reads, and end up at a café discussing their favorite books.