I mostly think it's for consistency reasons. It bugs me too but not enough to make me not like the show. It's like how in most shows someone can't dye their hair because it will throw the audience off.
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I mean there are people who strictly wear one type of shirt, most teen guys wear just t-shirts to school? you know? it's not like it doesn't happen. it is slightly annoying. but I know one kid who no matter what he always wear's a halfway zipped up leather jacket EVERY FRICKEN DAY. Annoying? yes, but it just goes to show, it does happen.
i noticed that too. however i wear a polo everyday, except mine is always tucked in. so i guess it happens in real life. ethan also a lot of times wears those gray (cargo?) pants. other disney shows do this as well.
shake it up, deuce 90% of the time has on the same blue jeans with the hole(s?) in them. i'm in the band, 85% of the time wears the blue jeans with holes in them and a lot of times a red unbuttoned button down shirt. life with derek, derek wore the same shoes every episode and i noticed he recycled tshirts and pants a lot too.
I think is kinda like "Two and a Half Men" with Charlie Harper wearing those cargo shorts and bowling shirts EVERY episode!(Don't forget duece weara those headphones around his neck ALL the time!!!