Just.
Who says that one must wear a hat and jacket while davening? The Mishna Berura and Aruch haShulchan say that a hat is necessary because in their time and place a man would not walk in the street without a hat. Today that ius not the case. Rav Mordechai Elaihu says the same about a jacket based on the Ben Ish Hai (and it is not a machloket between the Mechaber and the Rema).
As for pizza, it depends on how it is made and whether it is considered a snack or a meal in one’s place. RavMoshe says that in America one slice is mezonot but two are hamotzi. Some, but not all, Israeli poskim say that even one is hamotzi.
I do not know what is meant by “dipping foods”? Do you put them in a mikva?