Forgiving him depends on a lot of factors. If he is truly remorseful and willing to work on the relationship, it might be possible. But it won't be easy and will take time.
One common scenario is when the husband notices strange behavior like his wife being overly secretive with her phone. She might quickly hide it or get nervous when he gets near. Another is sudden changes in her work schedule or frequent 'late nights at the office' that seem fishy. Sometimes, a husband might accidentally find evidence, like a love letter or a suspicious text message.
One common story is that a wife might notice her husband coming home late very often with lame excuses. For example, he says he has to work overtime but she can't find any evidence of extra work when she checks his work stuff. So she starts to suspect and one day, she follows him after he leaves work and catches him having dinner with another woman and being overly affectionate.
One surprising story could be about a husband who planned a big surprise party for his wife with the help of their friends. They decorated the house, invited all their close ones, and when the wife came home, she was overjoyed. It was a great celebration of their relationship and the support of their friends.
If you've caught your husband in such a situation, first, take some time to calm down. It's a very shocking discovery. You could consider having an open and honest conversation with him about why he did it, your feelings, and what it means for your relationship.
First, they need to communicate openly. The husband should explain his reasons for crossdressing to his wife. If it's just a hobby or a way to relieve stress, the wife may come to understand and accept it. For example, they can set some rules, like when and where he can crossdress. The wife also needs to respect her husband's privacy and feelings.