YSK: When buying a suit, it’s generally expected that you will get the suit tailored to you so that it fits better. Plan to buy the suit at least a week ahead of when you need it to allow for the tailoring time.
from /r/YouShouldKnow
YSK：在购买西装时，一般都希望能得到为你量身定做的西装，这样才会更合身。计划购买西服的时间至少要提前一周，以便留出裁剪的时间。