NCAAM: Duke vs Portland State - long sleeve shirt
 

Player #1 for Portland State has a long sleeve undershirt with one sleeve cut off. Legal?

As described, no.

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Long sleeves are illegal in NCAA-M period, regardless of whether the sleeves are the same length or not (which is also illegal).

However, for the most part, no one cares. Unless the assignor stresses it or says to clean these types of things up, no one cares.

What about NFHS? Same thing?

"Badges? We Don't Need No Stinking Badges.” ...
 

NFHS rules regarding undershirts are the most restrictive, and should be the easiest to enforce by officials. Undershirts must be similar in color to the uniform jersey. According to NFHS rules, the home team must wear white uniform jerseys. Therefore, the only legal undershirt color for home players would be white, and only white. Players on the visiting team, wearing their dark road jerseys, must wear dark colored undershirts similar in color to their dark color uniform jerseys. “School color” doesn't apply to undershirts since “school color” is not mentioned in the current NFHS rulebook. Undershirts may not have frayed edges, and undershirt sleeves shall be the same length. Note that this rule does not require all players to wear the same length sleeves on their undershirts, but each individual player must have sleeves the same length on the undershirt when worn.

Nope.

And, NCAAW is different still -- long-sleeved shirts are allowed, but they must be compression material or tight-fitting.