Besides (X) S.M.L and Minimal, I'm not sure there are any other Indonesian brands that have successfully opened their own stores yet (please let me know otherwise).
Luckily though, you can alternatively go to The Goods Dept at Pacific Place mall (1st floor). This department store carries brands made by local Indonesian designers. Not only clothing, you can find here shoes, bags, wallets etc. Cotton Ink (a brand already quite well-known online), is an example of one of the brands you can find here.
And after browsing the store, they have a cafe as well where you can sit down and relax :)
|Source pic: http://www.gogirlmagz.com/beta/place/detail/the-goods-dept.html|