Certainly ensure that your dress code is appropriate for the occasion, but also makes you feel confident and comfortable. Attending a wedding is an occasion to celebrate love and unity, and your dress code honours and celebrates the couple.

Formal wedding: black or dark suit, white shirt, tie or bow tie.
Semi-formal: dark suit or formal jacket with trousers, can be worn without a tie.
Casual Wedding: Neat casual wear such as trousers and collared shirt, may be worn with a blazer.
Seasonal considerations: winter may require a warm jacket, while summer may require lightweight and breathable fabrics.