Your first impression is correct. "Light brown pants with black upper shoes" really doesn't match.

Personally, I suggest you dress like this:

1. If it is a formal occasion, I suggest you set the tone of "formal and serious" with shoes with black uppers, and it is best to wear formal clothes. Pants and shirts are preferred, and plain pants with polo shirts are also acceptable.

2. If it's just an informal occasion, you can start with light brown cropped pants, and the direction is "leisure and comfort". You can wear a pair of light-colored casual shoes with short-sleeved casual shirts or long-sleeved thin T-shirts.

You can find pictures of "Nine Pants" and "Black Upper Shoes" on the Internet as an auxiliary reference. The above wearing methods are all popular at present and absolutely reliable.