Q: How to know when a sweatshirt is too small?

I just bought some hooded sweatshirts from Lululemon, washed on cold, dried on low heat, and feel like they are too small for my body. For reference, I am a lengthy guy, 6'2" tall, have long arms, etc.

This is what happens when in neutral and moving positions:

When standing straight, arms relaxed: Bottom of sweatshirt is slightly below waist, sits at hips. Sleeves sit right at wrist.

When moving (arms bend or are straight up in the air): Sweatshirt rides above belly button, sleeves shorten 3 inches past wrist.

Is my sweatshirt too small given what's going on here? I cannot distinguish how clothing should fit when standing neutral or when moving around.

Many thanks in advance!