ENGLISH PILL 119/365: TO GET DRESSED or TO DRESS UP

to get dressed = to put on clothes
I get dressed after I've had a shower. (Felöltözöm, miután lezuhanyoztam.) 

to dress up = to put on a costume / to put on your best clothes
I dressed up as a zombie for Halloween. (Zombinak öltöztem be Halloween-re.)
I dressed up for my job interview. (Kiöltöztem az állásinterjúmra.)