They are probably using in-ear monitors.
In-ear monitors are small speakers; the good ones are actually fitted to the singer's ears. They have a wireless belt pack that is controlled from the monitor position, usually off to one side of the stage.
Monitors (whether in-ear or on stage) allow the musician to hear what they want. The sound on stage is usually "different" from what the audience (front of house) hears.
For example, when I perform, I like my vocals pretty hot (loud) in my ears, my own guitar, Bass Guitar, snare, and other vocals.
Another musician may want to hear vocals, keyboards, and kick drum.
Each performer is hearing what they want to hear in their own monitors; so the sound on stage doesn't have the same mix as the one being heard by the audience.
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They wear sometimes wear leather jackets
They wear T-shirts jeans, and leather jackets, tatoos, piercings, and wigs, the women all have breast implants too like Katy Perry, Christia Agulaira, even Amy Whinehouse.
Pretty much the same thing as anyone wears. It goes by their own personal taste, or what their image consultants want them to wear. Some wear suits, some wear jeans. However a style that has been most associated with Country Singers is Rhinestones.
When performing, opera singers wear costumes dictated by the opera company's designers for that opera.
more ladies are singers because they have better voices.
The first broadcast of the Grand Ole Opry
When all of God's singers get home.
no
singers aim for vowels as they sing because they support the tone. You can not get that rich town when aiming for consonants