Frustrated, Uniqlo doesn't have a lot of available sizes

I go in store, ready to spend $200+, men's clothing. Mostly for my job interviews this week + some casual clothes to go out. Almost all the items i want, like the normal-fit (not slim) non-wrinkle dress shirts blue & white are not available. They are ONLY available in XL or slim fit. I even had 2 employees help me & check the back or their computers, nope. I go online to their official website, same problem. I also saw chino green shorts, need it in a medium ish size 33-34, but ONLY extra large is available. Very frustrating they don't have my available sizes and clearly they run out of stock & it sells out fast. I'm dissapointed. All I bought was boxers cuz they don't have a lot of sizes available for a LOT of stuff. I love the store cause it's very similiar to the gap, but lower prices & from a japanese overseas brand. There was a lot of hype & excitement when a Uniqlo store opened up near me. I just wish they would stock things quick.

Does any1 work at Uniqlo know how often they stock up ? Isn't there a automated system that instantly orders in for the store and comes weekly ? When does the new season stuff come ? Every quarter or half a year ?