From the CCC on dress and the reception of Holy Communion

Respect is NOT short-shorts, or very short skirts or sweaters over leggings......

see these all here and in Ireland...

not modest

1387 To prepare for worthy reception of this sacrament, the faithful should observe the fast required in their Church.²²⁰ Bodily demeanor (gestures, clothing) ought to convey the respect, solemnity, and joy of this moment when Christ becomes our guest.