The little fart's getting too big for his britches!

放这么大的屁你的小裤子怎么容得下！

The velvet jacket actually comes with matching velvet britches.

这件天鹅绒外套，事实上有着同样一件配套的天鹅绒裤。

If you get too big for your britches , people will stop listening to you.

如果你太过自我膨胀，人家就不再听你说话了。

Yessir, if I was your Pa I'd take down your britches and muss you up a bit.

好的，先生。 如果我是你爸的话，我会脱了你的裤子然后把你给弄糟点。

SCARLETT: As if I couldn't get a better beau than that old maid in britches.

斯佳丽：那个穿马裤的老人以为我找不到比她的男友更好的人。

The closest similar English saying might be "He is too big for his britches."

最接近的可能是类似的英语说：“他太为他的裤子大。”

But he got too big for his britches and God tossed him into the eternal pit of everlasting yuckiness, also changing his name at this time to Satan.

不过，他傲慢过头，被上帝丢进了无尽而丑恶的深渊中，还被改名为：撒旦。

To his surprise it wasn't a doll at all, but a man of the tiniest size. He had a little wool shirt with old fashioned britches and a high tall hat much like a witch's.

让他惊奇的是，这不是一只玩偶，而是一个小小的小人，它穿一件毛绒上衣，一条老式的裤子，戴着一顶高高的巫师帽。