Summer, Not Modest, Is Hottest
In 1 Corinthians 8, Paul is not saying that we should self-regulate to prevent other people from doing sinful things on our account. He is saying that we may need to self-regulate to prevent other people from doing totally permissible things they think are sinful (but aren’t) on our account.
This is the meaning of the phrase “cause to stumble”. We want to help our fellow Christians avoid “stumbling” into the sin of legalism toward themselves; we are never told to limit our own liberty by being paranoid that we might make someone “stumble” into the sin of actual sin.
So, please, for Christ’s literal sake, stop telling women that when they wear bikinis or sundresses they are “causing their brothers to stumble”, because that is not at all what Paul meant, and it’s mega-hot outside.