Does bright-coloured clothing attract more mosquitoes? The truth is that they are more attracted to dark clothes, and it is likely that if we wear patterned clothes they will approach us more because they can confuse us with the colours of flowers.
Are they attracted by sweat? Each of us has our own smell that we do not know how to distinguish them, but animals do. Our smell has certain chemical markers that attract them more or less, and if we sweat these can become more intense.
Does drinking alcohol mean you get bitten more? This is true, since we metabolise excess alcohol and expel more CO₂ through our skin, which attracts mosquitoes
Does being overweight mean you get bitten more? Also true, because we are more likely to sweat more and emit more CO₂.