Avoid bad absorbing clothing. Wear wool or cotton, rather than synthetic clothes. If you have sweaty feet you better wear leather shoes.
If you sweat a lot you can use an anti-perspirant instead of a deodorant. This not only suppresses the smell but also reduces the sweating somewhat.
If an anti-perspirant doesn’t work you should visit your doctor. A prescribed anti sweat fluid may help.
In some girls and guys perspiration is excessive, far more than is needed to cool the body. This condition is called hyperhydrosis.