Some pools allow you to swim in jeans and tees,
usually for resistance training and survival swimming.
Don't be shy. Ask at the reception.
Jeans are best worn with a matching top,
like the classic white tee and blue jeans look, and maybe a hoodie.
Teenagers often prefer this modest style of swimming clothes.
Look cool in the pool.
A comfy shirt balances the look.
One More Thing
If you prefer to tuck in your T-shirt when swimming, choose a longer one that reaches to your thighs.
If you can't get it in your size, buy it one or two sizes larger.
Baggy is cool.
You may enjoy that more when jumping about.
His shirt is neatly tucked in.
Longer tees stay in place.
Dungarees are also good at keeping it tucked in.
These loose fitting bib jeans have no tight waist band, comfy for many splash sports.