I have these in the tall version, size MT. I am 6ft 185, with longer legs. This pant runs fairly big, I am a 32 waist and could probably get away with the S. They are also baggy, but the quality of these pants seems top notch. This is one of my go to resort pants, however, I wouldn't tour in them - just too much material.
As a side note, I am less than pleased with Arcteryx customer service. I was forced to purchase through their website because BC.com doesn't offer these in longer sizes. I wrote them to inquire about a refund / exchange as I was outside of the 30 day window and had only worn 1 time and I didn't hear back for almost 4 weeks. When they did reach back out, I got a canned response basically restating their return policy, which I was already aware of. I thought for spending $500 on a pair of pants they would be more accommodating / offer more options. Maybe try a different style? If I have learned anything in the outdoor industry, it is that customer service is #1. In this case, Arcteryx dropped the ball and I will honestly not purchase any more of their gear because of it. There are plenty of other brands that care about their customers. This is why I purchase everything through BC.com, they have the absolute best customer service and offer an awesome return policy.