The crew collar can feel more open when the surrounding styling creates space. Push sleeves gently if they move easily, wear hair away from the collar, or add a shirt or jacket that stays open. These are choices, not correction rules. Use the one that makes the complete outfit easier to read.
Use a final mirror check
Look first at the hem transition. Does the eye move from tee to bottom, or stop at a hard horizontal block? Next, check whether the collar, logo, belt, bag, and jewelry are competing. The small chest logo can remain the only upper detail when the outfit already has texture or a strong shoe.
Then move normally. Sit, reach, and walk a few steps. This is not a claim about how the tee feels or performs. It is a way to see whether your chosen tuck stays where you want it and whether the cotton body gathers more than expected. If the full tuck needs constant adjustment, return to the partial tuck or loose option.
Finally, compare all three choices with the same bottom if time allows. A quick photo can reveal where the black shape begins and ends more clearly than a close mirror view. Keep the version that preserves ease and creates one coherent outline. The most useful answer is the one that works with your proportions, clothing, and preferences that day.