It all depends on the brand and what they wear day to day ... you did not give us any info to go on. 
 
I always say, take a cue from what the managers and staff are wearing, and make it something similar. And take a cue from what they sell ... if it's dressy stuff, you should be dressy ... if it's super casual, then you may dress down a bit.   If they sell jeans as a major part of their stock and the other employees wear them, then I think that dressy jeans would be OK.  The Converse shoes ... not sure.  A dressier shoe might be safer .... unless, they sell really casual, funky/cool  stuff and their employees and the managers dress this way.  Better to overdress a tad than underdress, IMO.
 
A suit is not necessary ... unless the employees are required to wear them. I like the idea of a casual, well fitting jacket ... it can dress up a look without being stuffy.   Consider nice pants and the jacket you mentioned ... or pop a cute skirt under it with good looking shoes.
 
You always want to dress for the job you want, just a little bit better ... so keep that in mind.