There are different set bonuses for each sponsor. So it depends on what sponsor you are wearing.
just going from memory.
MAX has a chance to proc XP bonuses for an hour i think.
SE is the most common one used. anytime you win during a sponsorship you will have a chance to get an extra box. This is really handy while building apparel.
TG bonus is a chance to cut your coin losses in half if you lose a game.
The first set bonuses activate once all 5 are level 3. the chance goes up at level 6 and also at level 9. You're such a low level that i doubt you've got a set to level 9 yet.
I don't remember the Foxwind and CM bonuses.
The above three are the only ones to consider.
Virtually all of the coin players that play in the upper rooms don't have any set bonuses and wear a sponsor mixture of apparel.