buying pants

Today I went APM for lunch. I had curry chicken in the food court, and I saw Mos Burger, but it doesn't seem very attractive...

Then I did some window shopping, trying to buy some new pants for myself. (really....I seldom do this before)
Saw a loose pants in 無印良品 (~$295). Looks ok, and cost ok, but dunno if it really suits me.
I think I need some advice to help me buy some good pants.

BTW, yuen loi D-mop is very expensive.... everything cost over a thousand..