If it were me I'd hit the follwoing stores in this order:
Ross
Marshalls
Target
Old Navy
the goodwill.
yeah I said it, the goodwill. I have never had a problem finding something i needed there... not to mention the one at Blanco/410 has a whole section of stuff from North Star Mall with the tags still on... they were donated from Macy's and stuff.
It would take me about 8 hours on a Saterday or 4 hours ona a weekday to do this shopping trip, and I would refuse to spend more than $20 for the pants per pair and $12 per shirt. But by time I got home I'd have everythign I needed.
Damn, I am a shopping champion.