Examples:

• He claims to be a successful entrepreneur, but he's all hat and no cattle.
• She talks about her grand plans to travel the world, but she's all hat and no cattle.
• The politician's promises were all hat and no cattle.
• He said he could handle the project, but it turns out he's all hat and no cattle.
• She boasted about her connections, but she was all hat and no cattle.
• He talks a big game about his investments, but he's all hat and no cattle.
• The company claimed they had revolutionary technology, but it was all hat and no cattle.
• He likes to brag about his skills, but he's all hat and no cattle when it comes to results.
• She said she would organize the event, but she was all hat and no cattle.
• His promises to improve the team were all hat and no cattle.
• He said he was an expert in the field, but he was all hat and no cattle.
• She pretended to be wealthy, but she was all hat and no cattle.
• He claimed to have written several books, but it was all hat and no cattle.
• The startup's pitch sounded impressive, but it was all hat and no cattle.
• He always talks about how he will change things, but he's all hat and no cattle.