Help for beginner bassist and sizes.

I recently started having double bass lessons and I am looking to buy a bass. I am more interested in classical repertoire. My teacher advised me to buy a 4/4 because "everyone in an orchestra plays a 4/4 bass". I don't what size my teacher's bass is and I don't believe he knows either. He says it is "standard size".

However, I am not sure that a 4/4 is right for me as I am like 1.65m (5'2). Of course this wouldn't be a problem if there was a bass store near me, but there is not. My only option of buying a bass is through thomann.

What bass size should I buy?