It is a balance. First: never dress in a way that embarrasses your style or belief in how one should dress for an occasion, even if it means going far beyond a stated overly casual vibe. My friends are all used to this from me. No one says anything other than positive comments on how I dressed. That said, my intention is not to make my host uncomfortable or disrespect their intent. This is where you need to decide on how many levels you will kick it up. No one is wearing a tux to a pool party. But what about a blazer and wool/linen blend slacks with a collared shirt? Is the intent of the event to honor your friend’s retirement and he has asked that others all dress as a reflection of the life ahead of him, specifically calling out a relaxed approach? I will honor this friend by comporting to their wishes, but in my manner. Depending on the friend and situation, I may reach out to express my desire to do both and ensure they are comfortable with my approach. Remember: I have a PhD in psychology and overthink everything….