A two-piece suit for a wedding is a great choice, as it offers a stylish and sophisticated look. A blazer with a vest, also known as a pet, is a popular option for a two-piece suit. Here are some tips to help you choose the perfect wedding suit:

1. Choose the right fabric: A lightweight wool or cotton fabric is a good choice for a summer wedding, while a heavier wool or tweed fabric is better for a winter wedding.
2. Consider the color: A navy, grey, or black suit is a classic choice for a wedding, but you can also opt for a more unique color like burgundy or forest green.
3. Fit is key: Make sure the suit fits you well, especially in the shoulders and waist. Consider getting it tailored to ensure a perfect fit.
4. Pair it with the right accessories: A tie, pocket square, and dress shoes can add the finishing touch to your wedding suit. Make sure they complement your suit color and style.

Overall, a two-piece suit with a blazer and pet is a great option for a wedding. Just make sure to choose the right fabric, color, and fit, and accessorize it well for a stylish and sophisticated look.