Here's my breakdown on great being important:  Rock climbing - climbing gear itself obv, but clothing that's too loose can get sucked into your ATC or carabiners    Cycling - aerodynamic advantage, loose pant cuffs can get caught in gears     5707   Running in cold (less than 40°F) - sweat management is critical. Need something that will stay warm when wet, won't hold too much water (weight). Keep you warm but not make you sweat. Preferably NOT too windproof because you want more ventilation when you're moving    Hiking - cotton kills (warmth when wet)    Ironman - probably super-important but this is out of my realm     Other than those nuances, there isn't much to workout clothes. Just wear whatever and focus on your workout Also, lol - is that a 35lb plate on the Smith machine?