Is it acceptable to wear a collar bar or clip while wearing a bow tie?

A collar bar or clip is worn with a traditional neck tie. I have never heard of anyone wearing a collar bar or clip with a bow tie. Not even sure how you would pull it off but it sounds “excessive” to me. Read “The complete guide to wearing a collar pin (and how a collar bar and collar clip are different)”

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How to Dress for a Wedding: Men’s Suiting Guide
When it comes to dressing for a wedding, there can be a lot of stress that goes into the final outfit decision. Is what you chose too dressy? Not dressy enough? There is so much to be mindful of that it can become a bit overwhelming and sometimes even make you not want to go at all.

What shirt & shoes can I wear with white pants & a red tie?

Shirt and shoes should not be a problem to coordinate with your white pants and red tie. A colored shirt that looks good with red such as blue, purple, pink or even a mustard yellow would all look great with white pants and a red tie.  Other shirt ideas would be red and white or blue and white check or stripe shirts or a red , white and blue stripe or plaid shirt would also go with a red tie. Tan shoes or white loafers or white canvas shoes would look good with your white pants and are a better way to go than black accessories. If you are short wear a white belt and white shoes. Tan shoes and a tan belt would work with any of the combinations but are better on tall men. Shoes and belt do not have to match.