Congratulations - you had the foresight to install a recess in your new shower instead of using an ugly shower caddy that will inevitable turn into a rusted frame after a few years. But there's a slight problem.
Your bottle bodywash barely fits into the recess, so each time you shower have to awkwardly take the bottle out just to use it. Frustrated, you end up keeping the bottle on the shower floor, which defeats the purpose of having the recess in the first place.
Ensuring the height of your shower recess is well above the height of the largest bottle you'd expect to store in the recess. In most cases, a 1-litre pump-action bottle of bodywash is the tallest bottle in most shower recesses... but you also need to take into account the gap above the bottle for your hands to press the pump head down.
A typical 1L bottle of bodywash is ~25cm tall when the head has been extended, so consider a shower recess with a height of at least 35cm. Note this may have a flow-on effect to your choice of tile-size as well, as the height of recesses are often arbitrarily set to the same height as a single tile. This make it easier for your tiler to install the recess, but doesn't make it easier for you long-term if your tiles are only 300mm, for example.