I do dress up for Easter Mass no matter if I go to Vigil or the Sunday Mass on Easter Sunday.
When I went to Easter Vigil a few years ago because I was a sponsor/Godparent (my aunt and uncle also served as sponsors/Godparents) for my niece and nephew (at the time 7 and 9 years old) who were getting all 3 sacraments of initiation, it was a long Mass.
We had - the light/candle thing, 2 or 3 Old Testament readings, the Epistle, and the Gospel then the Homily.
After the Homily, was the Baptisms then Confirmations. About 10-12 people overall were received the sacraments (about 6 or 7 were young people from ages 7 to 13 then the rest were older teens/adults). Baptisms were first, and are done by immersion. My sister's kids each went one at a time then me and my aunt helped them change from their robes with shorts and tees with bathing suit under to dressy clothes. The rest of the baptism ceremony including the receiving the Baptismal candles etc happened after the candidates changed from their wet robes to normal clothes. Confirmation was next, and all the candidates were confirmed.
After that was done, then it was to the Prayers of the Faithful, the collection, and the Eucharist. The candidates went to receive their First Communions followed by their families, then the rest of the congregation.
We had beautiful music of a variety of instruments (piano, organ, a few guitars, drums, a few different types of woodwinds etc) and a great adult choir that provided wonderful & moving vocal music throughout the whole Mass from start to finish in various places.
A reception with finger food type snacks, candy, cake and fruit punch was served after for those received into the Church and their families/friends.
Mass started at 9pm, and it ended around 11:45pm or so.