As for orange vests in some Webguy photos -- those are Basics assigned for that day or for a particular transit from location to location to act as a "crossing guard" for the group. The bright blue belts (like old fashioned safety patrol belts) have been used in the past for Basics who were sick or injured and on restricted activity (no running, no calisthenics, etc). The bright blue belt allows cadre to remember who is not supposed to engage in strenuous activities.
I asked my daughter -- a C1C cadre for Guts -- about the different colored t-shirts -- some Basics are wearing the brown colored undershirts while they wait for the blue and white PT shirts with their names stenciled on the left breast area. The different colored shirts are nothing to worry about.
As for smoke, my daughter (who is in charge of early morning calisthenics for Guts) told me that on Friday the smoke was not a problem and Basics did their run outdoors. However, early on Saturday morning (5 a.m.) the smoke over the Academy was bad -- therefore, the cadre were told to conduct calisthenics in the dorm hallways. Don't know about today -- Basics are not required to do the early morning calisthenics on Sundays. I think at this point it is a day by day decision re outdoor exercise based on the fire, wind and heat on that particular day. On hot days, you may see lots of pictures of Basics marching and standing on the Tezzo level under the dorms -- where it is cooler and out of the sun. You will also see pictures of Basics all drinking from their canteens at the same time -- the cadre are keeping a close eye on heat, sun and hydration all day long.