2 questions here:
1-Why Mio will purchase a costume of Anglerfish.
2-Isn't strange that Shiho is able to wear everything that Mio accidentally send at her home?

And I think Maho will delay her next errands haha.

Gordark said:

1-Why Mio will command a costume of Anglerfish.

I'm guessing you meant purchase instead of command. Anyways, Miho over the course of both this comic and the anime has shown an increasing affinity towards the Anglerfish dance, so it's really no surprise to me that she would be ordering a costume. Although why she needs her own and can't use the ones apparently owned by the school is the real mystery.

2-Isn't strange that Shiho is able to wear everything that Mio accidentally send at her home?

The Anglerfish costume is basically a rubber suit, it stretches. The Boko costume is oversized and baggy for all of the characters, so there's room to spare. Now if something more form fitting like Miho's Great Tankery Strategy idol costume (image]) fits Shiho perfectly, then I'm calling shenanigans.

Gordark said:

2 questions here:
1-Why Mio will command a costume of Anglerfish.
2-Isn't strange that Shiho is able to wear everything that Mio accidentally send at her home?

And I think Maho will delay her next errands haha.

I have no idea, but my opinions:

1-Miho is clumsy cute, so it shows with her mailing issue. Or maybe the Ooarai's crazy culture is rubbing on her.

2-Yes indeed. Either it's "one-size-fits-all" miracle, or it's just that Miho is growing up fast enough.

Of course, I think Maho will be having slight nightmares.

Miho seems to be doing a lot of these "accidental" mislabeled addresses.

But Shiho does look good in them...

Shiho's still got it. Her personality is probably the only thing stopping her from being a MILF character.

And maybe Maho's not coming back from Germany ever again